| Reading for
|| Specific Reading Goal
|| Reason Why
||pH and Alkalinity and CYA affect one another. pH is buffered from TA, CYA
| Total Alkalinity (TA)
|| 90 ppm
||Alkalinity is normally the buffer against pH decrease. If pH drifts up, lower goal to 80 ppm. If pH drifts down, raise goal to 100 ppm.
| Cyanuric Acid (CYA)
|| 50 ppm
||Not higher than 50 ppm. CYA is also a buffer against pH decrease. CYA protects chlorine against degradation from sunlight and controls the amount of chlorine available for disinfection and oxidation.
| Calcium Hardness
|| 250 ppm vinyl pools 350 ppm concrete
||NEVER below 150 ppm. Maximum can be greater if source water has high calcium and magnesium minerals. Lower pH and TA to lower calcium.