My PH tends to rise from 7.6 to 7.9 over a 4 day period. I add acid to bring it back to 7.6 and then it rises again.
CL - 4
TA - 85
PH - 7.6 to 7.8
CH - 475 (Fill water is hard)
CYA - 70 (A little high but we get a lot of SUN in Arizona)
SALT - 3400
TEMP 88 AM - 92 PM (testing is usually preformed at 6:00AM after the filter has run for 2 hours)
CSI INDEX - Average is about +.06 depending on the temperature.
I do not run a SWG, using 3" Trichlor pucks.
The water is crystal clear. Any suggestions?