And if it's not PolyQuat, don't use it. PolyQuat is not a brand but rather a type of algaecide and clarifier--the only algaecide we recommend (besides, of course, chlorine).

You definitely have an algae bloom so it would make it easier for you to fight it to read up on algae here on Pool Forum. Meanwhile, since it IS an algae bloom, don't waste your time and money on PolyQuat--your daily backwashes will dump it out. Concentrate on hammering it with lots of liquid chlorine/bleach