Well for those of you who have been asking for updated photos of the swimming pond, here they are. I did have a few complaints about the plastic chairs in the final photos. In my defence, I have to say that we had 40 people coming for a party, seating for only 10 outside and a ready supply of chairs at the community garden – what is a man to do? the weather has delivered in spades in the last few weeks, we could hardly have expected such wonders. After one or two (minor) wobbles, the water has been crystal clear.
There has been nothing better after a hot day in the office/on site/in the car to come home to a cooling dip.
My youngest has been transformed from doing not a lot in front of the television to 40 lengths a day. And today, after spending most of the day in a seminar on building information model software followed by a stint on emails, I came back to a calm flat body of water at a soothing 23 degrees. Better still, as I swam, a swift dipped down in front of me and scooped up some water, a dragon fly scooted past and a profound sense of calm settled over me. For me, other than the reflections in the water (which I go on about ad nauseum), sharing the pool with everything else is a joy. I am sure that to some people, the odd newt or insect is one too many, but I love it.
The marginals have really taken off. The Butomus is starting to flower, as are the water lillies; the water forget-me-nots have been a delight. The only downside has been the lawn, which has really struggled in the hot weather, although the mole-mesh has worked a treat – although the borders are filled with moles hills, not a murmur on the lawn – truce! Best of all is the sense of calm and delight every time I look at it. Although I have to admit, this is a very expensive sense of calm.
So here we are. Sixteen weeks of mud, sweat and tears. Finally after all that, the pool emerges from the building site like an enormous butterfly, transformed from the ungainly caterpillar of the last few months into a fully formed swimming pond. Or it would have done if we had managed to get the planting in the surrounding borders finished – my fault, by the way. All those fine words about which plants we were using didn’t actually get them ordered on time. And although Rochfords and Provender did their best to get to site in time (and partly succeeded) there wasn’t actually enough time to plant them before the party.
After a mad sprint to the line (including Glen plumbing up the pump and jets on Saturday morning), the party is a great success. Lots of people go in the pool, including an inaugural swim by Vicky in her birthday suit (the new wet suit I gave her for her birthday, that is). We warm up around the firepit and watch the sun go down over the water.
Despite the sixteen weeks of mess and mud, it is a thing of beauty. As Allan Pollok-Morris put it – “WOW, that’s not a pool, it’s a chunk of heaven!” As I sit on our terrace on the Sunday evening and look at it, everything seems very worthwhile. Watching the sunset reflected on the still water, the pool achieves exactly what we wanted. The reflection of the trees and the sky in the water stirs something very deep inside me. I recall Rick Darke saying that for him, Landscape is all about trees and water. To that I would add sky.
So what have we learnt in this process? Well, clearly a lot about the technical aspects of natural pool construction. Lots of people said we were mad to put so many curves into the design, but I am glad we did – it really makes the scheme – lesson one: ‘stick to your guns’. The curves made it more difficult to detail, to construct and more expensive. But without them the pool would feel inserted into the garden. As it is, it feels as though it merges with the landscape. Once the planting gets established, it will wrap around the pool.
We started the process without having thought everything through. So perhaps lesson two should be ‘plan everything thoroughly’. Although, as I said to my brother on Saturday night, had we known how much it was going to cost and what was involved, we would probably never have embarked on the whole process. ‘A bit like having children’ was his answer. Not that I have any regrets about the pond, or the children. Lesson two therefore – ‘Do what you want to do and don’t worry too much about the detail until you need to’. Not a good work lesson, but not a bad life one.
Once the planting is more established and everything has settled in, I will post some more pictures. In the meantime, normal service on a wide range of subjects (and gripes) will resume…
Finally starting to look like a pond, although the water level will eventually be up to the top of the liner right the way across.
I know, I know – it’s been three weeks since an update. The principal reason for this was that not enough had happened after two weeks. And the principal reason for that was that some of the gang were pulled away on to other sites to do something a little more productive. But it never ceases to amaze me what a difference it makes to a site when the turf goes down. It suddenly changes in one go from a landscape site to a garden.
As you can see from the photo, we incorporated the famous ‘molemesh’ as it went down – fingers crossed. This allows us to share the lawn with the local mole population on the basis that they agree not to make any molehills. We have a signed agreement with the moles to this effect.
The line of the stepping stone path was ‘adjusted’ (that’s a great word for lifting and relaying 11no 115kg slabs of stone) to a slightly sharper curve, which we feel works a lot better. In fact we are delighted. Which is just as well, ’cos they sure ain’t moving again! The grass will be laid between the slabs at the very end of the project, once we have finished wheeling stuff down there.
We had a minor leak, which the liner guys came back and fixed for us. Note to self – make next pool a simple shape. The leak was luckily in the most accessible part of the pond, in trying to install the liner around the concrete buttresses for the metal edging.
The planting of the marginals is happening at the moment – see photo. The beds are first filled with special soil, mixed with light expanded clay aggregate balls to bulk it out (LECA, or Coco-pops as my sons call it). The plants are then carefully planted and a sealing layer of clay is placed over the top. Finally, a thin layer of limestone grit (otherwise known as cat litter by my sons) is laid over the surface. We have positioned some slabs to act as standing points within the lower beds for maintenance access. The lower beds are planted with lilies and other nutrient hungry plants. The upper beds are mostly ornamental. When complete, the water level will cover all the beds to the top of the liner – the pool is still filling at the moment.
It is such a huge relief to see green things arriving after so long with just mud, concrete and stone. Even the dogs have cheered up with the lawn going down, although they can’t understand why they are not allowed on it.
And some of you may have picked up from twitter that during that really hot bank holiday weekend, we had an inaugural swim in the pool (only about one-third full at that point). It was freezing, but felt great!
Just two weeks left to go now, and almost there… (I keep saying that, don’t I?)
As of Friday night, the installation of the liner is finished and the pool is (hopefully) watertight. I will resist all the obvious puns regarding liners and launching. Suffice to say that although we didn’t crack any bottles of champagne on the ‘bow’ of the pool, we had a small celebratory drink at what is after all a landmark in the construction.
You might remember from (much) earlier posts that we decided to go for polypropylene rather than PVC partly on the grounds of it being manufactured in the UK, but also because it is a lot less environmentally damaging in manufacture. My concern with this was that it was very stiff and might look a bit ruckled following installation. I needn’t have worried. The appropriately named Tim Pool (yes, really) who is doing the installation of the liner for us did a fantastic job with almost no creases or ugly lumps. It did take quite a lot longer than we expected (like most things on this job), but the result looks great. I have posted a couple of pictures of some of the details as well as the main photo. The marginal beds with curves on both sides were particularly difficult. To seal the liner against the sleepers was tricky – we don’t like to make things easy for ourselves – we used a chunky piece of larch that we used to secure the liner against the timber sleepers and then enclose in liner. This stops the liner tearing against the fixings once loaded with water.
On the lawn side we used a similar method with a strip of metal bolted to the metal edging, which was in turn secured in concrete haunching. This may all seem a bit belt and braces but the pull on the liner once it is full of more than 200 tonnes of water is huge.
Although the rain has made working on the lawn grade difficult, we have made progress towards final levels. So much so that I am now beginning to think we might not have enough subsoil and topsoil! All those enormous piles have gone – I can’t quite believe that all the calculations were right.
What I really cannot face is the incessant battles with the local mole population which has gone on for the last six years. This peaked when, on our return from our summer holiday a few years ago, we were confronted 40 molehills on the lawn. My heart sank. I spent 3hrs or so on my hands and knees opening the tunnels and burying all the soil so the lawn was green again. Next morning: ten fresh molehills – this was war! We tried everything – flooding the tunnels, battery operated sonic devices, solar powered devices, traps, with limited success. The ultimate indignity was finding a sonic device toppled by a fresh molehill – a sort of moley ‘two-fingered’ response. The dispute as to whose lawn it was dragged on for several years until I recently solved it (temporarily) by digging it all up. We had to find a more permanent solution by which we could both share the lawn. After a lot of research, we have come down in favour of a German product (suggested by Jens in our design office) which allows the moles to tunnel beneath the lawn but prevents them producing molehills. An honourable compromise that should restore peace. You can get details from Harald Unger at http://molebarrier.com/3.html. It is installed about 50-70mm below the surface of the turf. If I never see another molehill, it will be worth it.
From now it is a sprint to the finish. Marginal beds in the pool to be filled and planted, plumbing completed, paving laid, pool filled, lighting to be installed, lawn laid and decking constructed (both underwater and outside the pool). Soon there will be no more mud in the house…
Despite the weather (and there has been plenty of that, if you know what I mean), we are nearly ready for the liner. In the two weeks since I last posted on this blog, it seems to have been alternately too wet or too cold to do anything! Luckily, we got most of the blocks laid before the really cold weather set in, but we still had to take our chances with the few remaining stretches, as well as concreting around the sleeper walls. The results, as you can see below are almost starting to look like something recognisable as finished instead of random piles of earth and the odd block wall.
The money pit.
The costs have mounted up fairly alarmingly. By necessity, when we started on this, the design drawings had to progress pretty quickly leaving the finer points of the detailed design to be sorted out as we moved forward. As a result, although we knew roughly what the cost would be, there have been a few additions and we seemed to have forgotten one or two things…
Plants are people too.
Doing the planting plan for the big border to the right of the pond was a challenge. Plants are like people. They all have different characters. Some we have a sentimental attachment to and can’t help inviting to every planting plan. Others are old friends that we haven’t seen for a while, but bump into again. Planting plans for small spaces can be a bit like planning a difficult dinner party table! When its your own garden, it is even worse. I had to work really hard to keep reasonable sized blocks and sweeps of plants. My instinct was to try and squeeze in as many of my favourites as I could, but I knew space was limited. In the end, I limited myself to three grasses (not including the small patch of Helictotrichon I have sneaked in at the front): Muhlenbergia capillaris, Eragrostis spectabilis and Miscanthus gracillimus. This last is not definite but it was either that or Pennisetum.
Pink Muhly grass. In autumn, this beautiful grass creates a spectacular, billowy of mass of pink, airy flowers on 1m-1.2m stems.
We are lucky to have a fairly deep sunny border, on a well-drained gravelly soil. Whilst this does not suit all plants, it does mean that I can finally plant Eremurus robustus with some hope of it succeeding! I can’t wait! I have also found room for two of my favourite large perennials – Cynara cardunculus and Crambe cordifolia which should punch up nicely amongst some of the lower herbaceous material. There are few places in the garden where we really have the right environment and space for herbaceous material, so it is a delight to have some freedom. Nonetheless, there is still a framework of taller shrubs towards the back of the border and through some of the deeper stretches.
With the end now in sight, the first celebratory party is already booked. I always groan when clients mention this – “We’re having a party on xx; can you be finished by then?” As before with this project, now I can see why they do it.
I don’t want to bore you all with endless words and technical stuff on this. Goodness knows I’m getting fed up with having a mudbath for a garden week after week, so you lot must be bored stiff! So this week just a few quick pictures showing where we have got to.
A major milestone this week – the oak sleepers started to go in. We excavated a deep trench, rammed back fill around the sleepers and then concreted. We are using vertical sleepers in order to achieve the sinuous shapes those pesky designers have come up with. Actually, talking of pesky designers, I tried to draw a SketchUp model of the pool this week to try and get my head round some of the underwater decking (and because I thought some of you might be interested in it). But with all the curves, after three hours, I had come to the conclusion that building the full size model in the garden would be quicker! Whose idea was this anyway? The level of the top of the sleepers is just above water level by the way.
Although still muddy, at least it is level mud now!
The huge piles of earth have mostly gone now. The level of the lawn (I use the word loosely here) has been raised by about 600mm, and the remaining large pile of excavated material will be used as backfill around the sleepers. So I can finally breathe a sigh of relief that I am not not going to have to devise a landscape solution for a mini version of the the Alps in the garden.
No update on planting – I haven’t had time to do any planting plans. Proper work keeps getting in the way!
Although the design for the rear garden is finally starting to emerge from the muck and bullets, the front drive looks like a builder’s yard. In addition to the bulk bags of sand and ballast, pallets of cement, glass filtration aggregate, plumbing fittings, geotextile, reclaimed teak decking, and mulch visible in this photo, there is a 7m long roll of liner and 75no new English oak sleepers out of shot.
One of the principal features of the design is a curved path running around one end of the pool connecting the lawn to the forest garden. This is made up of single 1.2m wedge-shaped slabs of stone. Of course, with two garden designers, selecting the material was always going to be a difficult process. We had recently come across a very interesting stone from the Forest of Dean, called Pennant.
I had been vaguely aware of this stone for about ten years, but never really used it. We had selected it for a large project in Berkshire, and liked the subtlety of the blue grey and buff tones. As well as the quality of the stone, what really impressed us though were the go-ahead attitude of the quarry and the sustainability of the production process. All the quarried material is used and the production unit (which is under the same ownership) can process up to 1000m2 a week – not relevant to our garden, but very useful on our site in Berkshire! The stone saws are powered by the plant’s own hydro-electric power unit producing 13.5kW of power. The stone was supplied through Edward Tennant at Ashfield Stone, who was extremely helpful (www.ashfieldgroup.com).
The path swings on a single radius of 11.1m, so precision is absolutely key. Glen has been keeping a very close eye on the measurements, as there is no room for error. The individual stones (of which there are forty) weigh 106kg each, so laying them will not be easy. After looking carefully at all the possibilities, we decided on suspending the slabs from the end of the excavator arm using a stone lifter. This should allow us to rotate and position the individual slabs very accurately. They will be delivered in about two weeks, so we will see. The block-work support for this path is going in at the moment.
Selecting the timber has been equally tortuous, for various reasons. There are a number of locations which have different requirements hence a variety of timbers are being used. The retaining walls for the lower areas are vertical (new) oak sleepers laid in sweeping curves. Within the pool, the main walls are topped of with capping of western red cedar (which will be under water.) In addition to this, there is a deck about a metre below water level at either end. This is to be made of reclaimed teak decking on a network of larch beams. It is not possible to use any treated timber in the water, because the chemicals used in the preservative process are effective biocides. There is also a deck suspended above the northern end of the pool. This must also be of larch bearers. We wanted to use locally sourced FSC timber wherever we could. The sleepers were fairly easy as there are many companies supplying English oak sleepers, but the other timbers were more difficult. EcoChoice (based in Cambridge – www.ecochoice.co.uk) were particularly helpful. We managed through them to find some really good British grown larch and western red cedar. I had only come across Canadian or Russian WRC before, so this was a revelation to me. the timber is a little knottier than Canadian, but a lot cheaper and perfectly good enough for our purposes.
A spring scene: what is left of our lawn, with the pretend farmyard in the distance (aka the messy area next to my veg garden) and the edge of the new herbaceous bed in the foreground.
Although the end is in site, I don’t think we will be finshed for when my family descend at Easter. What’s more, inevitably other work is starting to clamour for the team. Suddenly I am feeling like one of those clients who says – “It must be finished for my party on Saturday Week”. I’ll start changing the design soon…
I am beginning to develop designs for the main herbaceous bed. Not that we can agree on what plants to use. And as always, visualising herbaceous plants in their summer glory in what still feels like the depths of winter is a cross between torture and therapy. More on this next week.
Week three of the swimming pond saga and the garden still looks like the outskirts of a Welsh mining town.
The blockwork walls of the deep swim area are almost complete and now stand proud of the surrounding ground – although eventually they’ll be about 300mm below water level. As our garden is on an appreciable slope, we have planned this ‘perching’ of the pool in order to minimise the dig but also to redistribute what was in the hole around the garden.
So where our lawn was sloping it will be flatter, and beyond the pool the ground will need to be terraced to take it back down to existing levels. How this will be achieved when there are spoil mounds on almost every inch of ground remains to be seen…
Plans for our food forest
John has asked me to write a bit about our forest garden plans this week so here goes:
For those unfamiliar with forest gardens they are basically self-regulating, food-producing ecosystems designed to mimic the structure of a woodland edge – optimum light, shelter and layering of groundcover, shrub, understorey and canopy to give abundant production.
This is based on the principle that nature is always pushing towards climax vegetation (woodland in the UK) so why not harness that energy and work with it, adapting nature’s tendencies for our own ends.
How it should work
Briefly in an ideal forest garden all your resource inputs are minimised:
minimal weeding as planting or mulch covers the ground completely
minimal watering once established due to the woodland microclimate
minimal pests and diseases due to the biodiversity
minimal feeding as the design incorporates sufficient nitrogen fixers to feed the rest via microrrhizal activity. Potassium is added via comfrey mulches, etc
All of which is just as well as between us John and I are pretty rubbish at nurturing our own garden on the whole. Looking after three children, two dogs, a business, a community garden, a neglected house still in need of major renovation, four ducks, eleven chickens, some raised veg beds and a lawn that seems to be the mole-magnet of the county seems to fill most of our time…
Factoring in existing ‘challenges’
And as with everything we do at home, our forest garden will be a bit of a compromise: partly since we’re working with a set of existing trees, none of which fix nitrogen, partly because our garden is quite exposed with the sun and wind both coming mainly from the west, and partly because the forest garden is where our chickens roam – good for fertilisation, bad for growing a productive herb layer. Oh and then there’s the rabbits that pop over from the field next door for a little ‘silflay’ every morning…
How it will work – we hope
The idea is to plant some Italian alders along the northerly boundary where they will add shelter and fix nitrogen but not shade the already dappled forest garden too much – luckily the existing trees are birches so there will be some sun getting through. An Autumn Olive (Elaeagnus umbellata) planted for its flavoursome berries next to the southerly hedge, will also fix nitrogen. Altogether this should give us enough nitrogen to satisfy the existing trees and our proposed fruit layers.
As our soil is very sandy and free draining, the terraces we’re planning will help to retain runoff in the forest garden. Along the edges of the terraces we’re going to use the bulky tree waste and hedge trimmings we’ve stockpiled at the bottom of the garden from the removal of numerous unwanted or elderly trees and shrubs. These tree waste bunds will be covered with the turf from the old lawn to create ‘hugel’ beds; the slow break down of the tree waste will release nitrogen over a long period and enhance the soil structure. Rebel farmer Sepp Holzer uses this technique on Austrian mountainsides to great effect.
As well as fruit and nut trees, we’re planning to grow some bamboo near the pond. This will not only act as a much needed shelterbelt but we hope to harvest the shoots for eating.
It’s all happening so fast!
The apricots, almond, hazel, quince, medlar, gage, damson, Mirabelle, plum, blue honeysuckle, cherries, fig and berries-too-numerous-to-mention, have started to arrive from Martin Crawford’s Agroforestry Research Trust in Devon and various other specialist nurseries, and we’ve been busy heeling them in until the areas are ready for planting. And before you ask not all the plants are going in the forest garden – some will go nearer the house and some in the front garden.
And we haven’t even started on the planting plans for the pond itself and its immediate surroundings! Looks like a busy weekend ahead with another round of decisions and compromises…
Recommended reading on Forest Gardening and Permaculture in practice:
After a number of requests from readers, I have relented and am keeping a blog of the construction of a swimming pond in our garden. From now on I am a client…
Getting out of the ground
This has been an interesting week. We started with a very big concrete pump. Although not the greenest solution, we had decided to use hollow concrete blocks for the main part of the retaining walls. I say the main part, because it is effectively only the central section of the inner concrete walls – the ones that support the deep swimming area. The outer edges of the retention (for the marginal areas) are provided by Oak sleepers, sunk vertically into the ground – more on these in a couple of weeks. The lowest section of the pool drops down between the concrete ring foundations for about another metre, effectively unsupported by the retaining walls.
For those of you who don’t know, concrete pumps normally come mounted on a lorry and are available in a variety of sizes right up to something that will pump tonnes of wet concrete up a seven storey building. We had ordered a fairly small pump with a long hose. Unfortunately what turned up was a large pump with a short hose. The pump was too big to get into our driveway, so with a combination of the pump lorry and the concrete lorry, we managed to completely block the street. The hose j-u-s-t reached the end of the excavations, which meant that Glen, Glynn, Mark and Ben had to shovel all the wet concrete by hand around the foundations. Setting out the foundations for the curved walls of the pool proved a little challenging amidst the mud, but it looks great.
I am sure there was some under-breath cursing of designers and their crazy ideas. Straight would have been so much easier…
The next step was drilling holes in the concrete and epoxy fixing in the re-inforcing rods. With this done, the laborious effort of carrying the blocks down and laying them over the rods began. Even with the cold weather we have been able to continue laying blocks. We have a boiler to heat the water if we need to, but so far we have not had to resort to this. The ‘hole’ seems to have afforded a sort of microclimate and the
blocks were not cold to the touch this morning. Finishing block-laying fairly early in the day and covering the new work with hessian to insulate it helps a lot, and we have had no failures so far.
Of course, all this has carried on with our garden still looking something like the spoil heaps around a mining town. Our neighbours came back from a three week holiday and couldn’t quite believe their eyes. The dogs have found it very – interesting. The garden had clearly become quite boring after six years, with only the odd rabbit to offer diversion. Suddenly, it is a whole new world. They have reacted differently to this. For one it is traumatic – she goes and uses the very small patch of grass remaining before scuttling back inside to familiarity. For the other, it seems to be a constant source of amazement and excitement – she can’t wait to get outside each day when the guys arrive.
On Thursday Glen went on a construction course on swimming ponds, perhaps a week or two later than we would have liked, but still timely. It allowed us to fine tune quite a few details of the design, but also made us realise we seem to have got most things about right.
Meanwhile, Vicky and I have been trying to sort out some of the planting. The lower part of the garden is going to be a forest garden with layers of different plants producing different crops. We are just putting the finishing touches to this (after a lot of ‘discussion’) and there will be a lot more detail in next week’s blog, along with some of the outlines of pernaculture principles behind the design.
After a number of requests from readers, I have relented and am keeping a blog of the construction of a swimming pond in our garden. From now on I am a client…
Sowing the seeds
We have been in the house six and a half years now. Two garden designers, two opinions, no progress. Well, not quite true. We had taken a lot of things out – conifers overgrown from the original intention twenty years ago, like cuckoos that never flew away. Delightful echoes of the past such as Choisya ternata aurea, Ribes sanguineum rosea and Potentilla fruticosa. Finally a plan starts to gel between us. It starts with a big curved border beneath the Mulberry tree. Then comes the notion of a forest garden on permaculture principles at the bottom of the garden. The fall on the lawn annoys me though, and gradually, the idea of a much larger pond between the lawn and the woodland starts to take shape in our minds. After a lot of wild sketching, we have the skeleton of a plan – a 14m by 4m swimming pond. And then unexpectedly, events intervene. A team of Bowles & Wyer’s becomes free for a few weeks. I grab them!
With Glen Brown, our hard landscape supervisor, I pore over drawings in the office. We discuss many different ways to build it – should we use concrete blocks, in-situ cast, polystyrene formers or timber walls? Lots of lengthy conversations and long email exchanges with David Nettleton of Clear Water Revival ensue. Eventually we go for perched concrete foundations and re-inforced hollow block walls for the main pool walls and new oak sleepers for the secondary walls. Will we be able to lose all the spoil on site? (actually that remains to be seen). Will the levels work out? (that also remains to be seen) How much concrete will we need? Can we get a digger in? All the usual designer/contractor questions. Except this time it is complicated by the fact that I am Designer, contractor and client.
“How Much?!” I find myself exclaiming; “Out of the question”. A myriad of decisions that have to be taken balancing method, size, layout, materials and of course a mass of technical details. One novel feature is that we only have to do technical drawings – no visuals or coloured presentation plans to convince a client!
Finally, a date is set for starting on site, even though we have not yet bottomed out all the costs or details. Not exactly seat of the pants, but not quite comfortable either. On a frosty Friday in early February, the team arrive. First day is just preparation – hand clearance, draining the existing pond, making sure the route for the excavator is clear.
On the Saturday, I let our (four) ducks out as normal. three of them are Indian Runners, and true to form, they go tearing across the lawn towards the pond. Their eye level is quite low, so they don’t see that their pond has been drained until they get within a metre or two. They stop in amazement. I can almost hear the duck voices saying – “What the…where…I’m sure it was there yesterday….!” They wander back up the lawn, confused and disorientated. They will have to wait a long time for the new pond to be finished, but it will be worth it!
Week One – green shoots.
The 5 tonne digger arrives. after a quarter of a mile trek down the bridleway and a sharp 270 degree turn through the fence at the bottom of the garden, we are in! Work proceeds quickly – the lawn gets stripped, topsoil is scraped off and piled up separately. We rapidly get down into gingery coloured gravel subsoil and at the bottom of the excavation is a fine amber coloured sand layer, very free draining. By the end of Wednesday we have the bulk of the main excavation out. As a result, most of the garden is covered in large piles of soil. My 15 year old son asks me where this is all going to go. I furiously check my cut and fill calculations, cross my fingers and say airily that it will all get used up back-filling and making up the levels. Perhaps if we fill our pockets every day, like the great escape and walk around outside in little circles…
Meanwhile, I am trying to sort out the final details with David Nettleton. PVC, Butyl or Polypropylene liner? Welded on site or off site? Do we need an Iron Reactor? As David explains: “This unit is not entirely necessary and could be added later. It’s a unit for emergencies; if the pond gets enriched with phosphorous or somehow you get a spike that encourages algae it will release Fe3+ ions into the pool to capture Phosphate Ions and precipitate them out. Very clever stuff!”. However having had our water tested, it is apparently ‘very good quality’ (which is reassuring), so for the time being we are passing on the Iron Reactor. We may live to regret it. For the liner, it is a choice between a whole roll of Polypropylene made in the UK, of which we will use about half, or the much less environmentally friendly PVC which comes from Germany. Both are expensive (client in me speaking there) so we plump for the UK made, environment-friendly product. Friday is spent making finishing the excavation of the main pool and making everything safe. By tomorrow, we will all breathe a sigh of relief and I will not be alone in wondering where my garden has gone. On Monday, it will start all over again.