I am building a prototype greywater-filtration-to-pond system that will incorporate a 5 x 15' filtration bed (filled with filtration media (small round stones, sand) full of filtering plants) that then releases into a roughly 10' x 20' pond, 3' at deepest. Will be determining how well the filtration works, etc.
My question is, I'm trying to be as frugal as possible on the construction (trying to keep the build-cost/water-savings equation in check) and am wondering if I might get away with a cheaper alternative to a 45mil Firestone-type liner, especially for the filtration bed.
Besides a 14.5 mil PVC liner (about 40% the cost of 45mil), I poked around the interwebs and found a place that sells billboard tarp plastic, new and used, http://billboardtarps.com/product/10...il-0-27-sq-ft/
Any experience and or advice on whether this might be okay? Or am I being penny wise and pound foolish?
Thanks!