I had my water tested and the CYA was 60ppm. Everything else was fine except the alkilinity was a little low. The guy at Leslie's recommended shocking with a non-chlorine shock treatment (Fresh and Clear Chlorine-Free Oxidizer). This is actually what I typically use to "shock" my pool. He didn't seem to thing that Polyquat would do any good. He also suggested increasing my cleaning time to 6 hours.