Hi, I am replying to this old thread I posted last summer because I cant seem to post a new one and the question is similar....15x32' rectangle 19K gal IG vinyl pool
My question is about CYA of ZERO, how much should I add and do you recommend any from amazon?
My other levels are FC 2; TC 2; ALK 50; Ph 7.4; copper 0; iron 0 phosphates 500; Cal hardness20