Calculator - for fixed bodies of water Enter the two parameters and click "Calculate". Parameters   Gallons of Water PPM of Chlorine   Results   Pounds of Vita-D-Chlor Kilograms of Vita-D-Chlor Formula Pounds of Vita-D-Chlor = Gal x PPM / 45,400 Kilograms of Vita-D-Chlor = Gal x PPM / 100,000 where Gal=Gallons of water to be treated PPM=Parts per million of Chlorine to be treated