Great thread. I'm experiencing the same problem and everything that has been said has been helpful. I am going to follow what was said for the others. My question is what product can I use to raise the alkalinity. Right now I'm at 45. My CYA is 50, Ph 7.2, FC 3. I don't want to buy one of the Pool Co. products for fear of what else it may do. Is theree a "pure" prooduct I can add.