Quote Originally Posted by tundraSQ
It has been posted in here many times that the Polyquat WILL drop the FC level, so you will need to compensate for that.
Didn't know that

Always went by Ben's notes regarding poly 60 "Generally, higher chlorine is the best way to control or kill algae. But, occasionally, an algaecide can help. There's really only one product that you can use without risking some rather nasty side effects, including pool stains, green hair, problems with combined chlorine, or disappearing chlorine, and so one. "

I haven't had a problem with it dropping fc levels, but I normally only use 3-4 ounces a week. When using the larger amounts a few yrs ago dealing with the algae I just attributed the lost of cl to fighting the algae.