Re: 15,000g how much absorbic acid to lower 1ppm of chlorine
1 ppm FC in 10,000 gallons would get eliminated with 3.3 ounces of ascorbic acid so in 15,000 gallons that's 5.0 ounces.
You can neutralize chlorine by using a chlorine neutralizer such as sodium thiosulfate or you can use hydrogen peroxide. It takes roughly an equal volume of 3% hydrogen peroxide to neutralize the same volume of 6% bleach. So for 1 ppm FC in 10,000 gallons, that's around 21 fluid ounces. For 15,000 gallons, it would be around 31 ounces or roughly 4 cups of 3% hydrogen peroxide for 1 ppm FC. You can also get Baquacil Oxidizer which is 27% hydrogen peroxide and use 1/9th the volume. So to get rid of 5 ppm FC in 15,000 gallons, it would take around 17 ounces (about 2 cups) of Baquacil Oxidizer.