I would welcome any advice. I am building a pond for the first time, it is a large pond approx 60 feet by 30 feet and about 6 feet deep in the middle. It has been excavated and now I aim to put a layer of "Teram" geotextile (bit like weedblock fabric) followed by about 1 inch of sand and then I aim to put down "silage sheet", this is the plastic farmers use to line silage and slurry pits and comes in very large sizes. It is much cheaper than official pond liners. Then I intend to cover the sheet with another layer of geotextile and then sand with patches of gravel for cosmetic effect. It will be trickle filled via a small pump from a stream which comes off the mountains. Questions: anyone else used silage sheet? I'm pretty certain the sheet is UV stable but would welcome comments and any advice?