Long Hot Summer and Pool

[DallasVal]

It is actually 7.8 - test kit goes to 8.2 and the colors are noticeably different. The spa has a fountain and water circulation is shared (common pump), so it aerates. I'll take your advice and drop the pH for a while to see what happens. As I read your response, I also need to keep TA lower (which will happen as a result of pH going down with muriatic acid added). It had been hovering in the 80 - 90 range in the beginning. Back then, when I took the water to the pool store to have it tested as verification of my tests, the guy was adamant that I needed to get TA up to 100 - 125.

Thanks again.