What causes the calcium hardness levels to deplete as the water temperature goes down?
Chlorine = 8.0
Ph = 7.6
Total Alkalinity = 140
Calcium hardness = 190 (last week it was 210 and I added 4 lbs of calcium chloride).
CYA = 50
Temperature = 51 (pool - last week it was 61)
Pool is 16,400 gals. Gunite.