You know I can't believe this myself, but I walked into a Danbury Ct. pet shop that has about 500 gal. saltwater fish, corals and inverts and about 900 gal fresh water fish. I couldn't believe it when I was there they were doing a saltwater change using tap water, I asked if they at least put a declorinator in it ,as you may have guessed, the answer was not usually. They changed 50 gal.I have to admit that I have bought from them without any problems. Buy the way, they have a beautiful oyster I'm interested in. I posted some quest. about oysters in a separate post. Awaiting your help.