Bender of Nails
Join Date: Jan 2009
Location: West Coast BC
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You mentioned thorough cleaning because you couldn't get the tank out to replace it. Just a thought, but if you can access the top of the tank, you could cut an access opening and use the tank to support and protect a bladder.
Sealing it with epoxy is another option, but I don't have enough personal experience with that to comment on it. West System has some water tank info on their site and their info on other epoxy applications is pretty good.
"Verbosity leads to unclear inarticulate things"