Reminds me of the Firestone rubber pond liners in some aquaculture and Koi pond supply catalogs. The catalogs said something to the effect," Do not use the rubber that is used on roofs as it has chemicals in it that can kill your fish. It is not the same thing." Funny thing is the stuff used on roofs that looks exactly the same says it's safe for aquatic life. Only downside is it's not usually available at the building supply stores in pieces over 6 feet in diameter.
Who's kidding who here?
