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  1. C

    Huge daytime Cl loss; no loss at night

    I’ve had this pool 8 years and haven’t had this problem since learning to shock properly. I shock my pool to 20ppm in the evening. No loss by the next morning, but all of the chlorine is gone when I get home again in the evening. Using a DPD/FAS test for chlorine. Stabilizer is 50 using Clorox...
  2. C

    Chlorine testing after adding Oxysheen

    I just opened my 18,000 gallon pool and shocked with 4 gallons of liquid chlorine. FC was 1ppm and CC was 6ppm. Pool store said to add 18lbs of oxysheen. Now my FAS/DPD test is showing 14ppm FC. But my OTO test is still showing 1ppm. Does oxysheen cause the FAS/DPD test to show high FC...
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