Dechlorinator Calculator These calculations are based on a known FLOW RATE of water through the Dechlorinator and a known FEED RATE of dechlorination solution(mixture of Vita-D-Chlor and water) into the Dechlorinator Enter the three parameters and click "Calculate". Parameters   Flow Rate in GPM PPM of Chlorine Feed Rate in GPH   Results   Pounds per Gallon of Vita-D-Chlor Grams per Gallon of Vita-D-Chlor Formula Pounds of Vita-D-Chlor per gallon of water = (Flow x PPM) / (750 x Feed) Grams of Vita-D-Chlor per gallon of water = (3 x Flow x PPM) / (5 x Feed) where Flow=Flow rate of water through the device in gallons per minute (GPM) PPM=Parts per million of Chlorine to be treated Feed=Feed rate of dechlorination solution into the Dechlorinator in gallons per hour (GPH)