It is crucial to test on your CYA stage so that you can determine what FC targets to use. In case you don’t Use a SWG, CYA is usually held between 30 and 60ppm. In case you have a SWG, CYA is typically kept between sixty and 90ppm (see notes). I've PooLife NST (70% CalHypo) tabs that go in skimmer basket leftover from final 12 months. I could pe