Re: Struggling to Keep at Shock Level
A gallon of bleach will raise 10,000 gallons of water 5.25ppm. Since your pool is 15,000 gallons that effect is negated some, use Michael's BleachCalc for specific dosages. Also, that chlorine could still be fighting algea, etc in the pool. A real test would be to add bleach tonight then wait an hour, test the Cl and then re-test early AM. Any dip beyond 1-2ppm lets you know that the chlorine is still killing stuff. Also, with 0 CYA you have no stabalizing power in the water so that chlorine is going to get used up and burned up by the sun that much quicker. I would wait to add CYA till you are confident the algea bloom is gone because that will only inhibit the chlorines ability to kill it.
Outside of Philadelphia, PA
18' x 40' IG - 22K gallons
Sylvan Gunite Pool (1979)
Plaster re-done (1997)
48 Sq Ft Hayward D.E. Filter (2003)
1.5 hp Hayward Super Pump (2006)
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