I've helped my dad build a couple of ponds. It seemed every house we lived in we built one (for koi). It has been a while, but the last one was pretty big, at least 6' deep X 4-5' wide X 20' long. Very nice, with a bridge to cross it and waterfall, etc. I cannot remember what we used to seal it, but I believe it was an epoxy of sorts. I can certainly find out easily enough, he still lives in the house. The pond is still in use, and it never had any problems. Looking into the koi enthusiasts will yield the best results for ponds imo...

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