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We have a fair amount of plaster damage that has developed over the past 2 seasons in our 25+ year-old pool. It's most pronounced on the walls, particularly at and closer to the surface. From my research on the forum, I think it's likely due to having the pH too low. Is there anything that...

Pool guy opened our pool on Tuesday and it's a swampy mess, so I've begun to SLAM it. I had to do that at the beginning of last season too to get it cleaned up. This time, however, our CYA level is absolute 0. The Pool School info on CYA says that "After adding CYA you should leave the pump...