To funny, I thought I was gonna get tossed from a store when Ibought replacement sand, I asked if he had any reagents, he said no, only way to test water was with test strips, that I was going way overboard testing with reagents lol, I couldnt get out of there fast enough. I just called another pool store, they have there version of polyquat 60 for 25$ will have to go check it out tomorrow. I lowered my brush down the side of the pool and I could make out the shadow of the brush only about 3 inches from bottom, I`m hoping like crazy maybe in the morning this crap will have settled to the bottom