No, but it's a good idea to keep on hand anyway in case of emergency. A lot of folks on this board swear by Prime made by Seachem. I have been using Tap Water Conditioner made by Aquarium Pharmaceuticals because it is concntrated and goes a long way.
I read a thread today where someone's child got a cleaning wipe into the tank and used it in case bleach had been in the product. (Turns out it was bleach free.) I also bleach my filter socks in the washing machine. I put some in the sump when I swap the socks out just for that little bit of security. There's a million different things that could cause you to need to do a large water change NOW and not have enough
RO water on hand or be able to make it fast enough to deal with the issue and chlorine remover is cheap enough to keep in your tool belt.
It is a violation of federal law to use this product in a manner inconsistent with its labelling.
Linear Mode
