Opened the 28K gallon pool yesterday, and again this year there was significant build up of lime scale on the walls and floor of the pool. It does brush off with a wire brush but there was literally many pounds of the stuff. Initial testing of my pH was off the charts so I began adding acid. It took 8.5 gallons of 31.5% acid to get it down to 7.2. Using the pool calculator in reverse, it would seem that my pH was 11.5! I know that the pH the morning the pool closed 6 months ago was 7.2.
The pool was completed construction 2 years ago. I would have thought that the 'new plaster effect' would have mellowed some but apparently not. This is fairly similar to last years opening. How much longer/ how many more openings should I anticipate this?
Any input as to what else may be causing this, or way to treat this would be greatly appreciated. Should I be testing and adding acid during the winter months, under the solid cover? Also, is my assumption that the lime scale is a result of the high pH correct?
Thanks for your input.