My last test numbers...
C - 0
PH - 7.6
TA - 100
CH - 650
CYA - 60
My pool size is 13650 gallons. PoolCalculator says add 102 oz of chlorine to bring the FC up to 7. I added 128 oz (1 jug) of Liquid chlorine that I bought at NPS store. As per Pool calculator, FC should raise to > 7
But, I tested my water after running the pump for 30 mins after adding the chlorine. FC was 5.5.
Any ideas on why FC was not raised to > 7? I noticed this a few weeks too. Then I was buying liquid chlorine at Lowes. I thought Lowes has old stock and chlorine must have lost its strength. I checked with NPS associate and he said they get a new pallette every week. So, it can't be too old.