So Friday night, I drained about 75% of my pool due to high CYA levels. After it filled up (took about 17 hours to fill back up) I noticed a few blisters in the plaster which broke open when I touched them. I noticed it on my top step and a few additional ones on the bottom of the pool. Did this happen because I drained the pool? Are those spots problems other than cosmetic?
Thanks!
Thanks!