Been following TFP for tips for years, you folks are great. First post. I have a lingering green algae problem that is not going away despite a super shock & scrub (above 24 FC, I know probably not good for some plastic pool parts). Also been doing the phos free for weeks.
So people don't like Copper sulfate because it stains, but should I care with a blue gray plaster with blue gray 3M that is not uniform color?
I don't know what is worse for people's health, Copper sulfate, or this Polyquat 60 with a chemical name I can't pronounce. I've used it before but just makes me worried.
Plus it seems with Copper sulfate I can reduce chlorine levels, which is health benefit. Any other downsides to Cu? My house plumbing is Cu, seems couldn't be that bad, but then again, if it kills algae, what else can it do?
Thanks for any tips