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Having a wierd deal with my Ph. It keeps reading 7.4 and the calculator says 39 ounces of Borax. Two days later, I'm back to 7.4? My TA is 70. FC is 10. CYA is 45. What am I missing?

I started a SLAM last night because I found a few minor spots of mustard algae on my walls and floor, in spite of the water being crystal clear and my OCLT is only at 1.5-2. I did a bit of a shock on Monday night with what bleach I had on hand. Here are my numbers at the start of the SLAM: FC...

Hello all! Here's my story: I've been using the same pool store for years, and while I've been generally satisfied, something happened recently that led me to this wealth of information. About 2 months ago, my water sample tested at 70ppm for CYA. I was told to drain and refill as much as I...