I believe I've read on the forum that chlorine will break down algaecide (polyquat). When using algaecide during pool closing, won't the pool consume more FC than if you had not used algaecide maybe to the point of total FC consumption well before opening? At the very least, wouldn't the chlorine break down all the algaecide negating any benefit of its use leaving you with much lower levels of FC?
Last closing was my first and I did use polyquat. I opened to crystal clear water with a residual FC of 2 and no CC. I guess I can just repeat but wanted to educate myself first.