We built our pool in October. Since we have opened it we can not seem to get the PH to stop spiking. We can get it lowered with Muriatic Acid 29% but it comes back in a couple days. On another note, we are also starting to see some discoloration (lightened ring) in the deep end. Pool is 25k gallons and we used Marbletite finish. Salt Pool. Here are the current readings
PH -8.8
TA 110
CA 50
Chlorine - 3.6
CH - 400
PH -8.8
TA 110
CA 50
Chlorine - 3.6
CH - 400