Enter your Water Volume, Current and Desired Chlorine Concentration, and Chlorine Product Type to calculate exactly how much product you need to add — the Chlorine Dosage Calculator gives you the Amount Needed, Product Weight, Concentration Increase, and the Safety Factor Applied so you never over- or under-dose your water.
Chlorine Amount Needed
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Weight of Chlorine Product
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Concentration Increase
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Safety Factor Applied
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For drinking water, the EPA recommends a maximum chlorine level of 4.0 ppm, with typical levels ranging from 0.2 to 2.0 ppm. Higher concentrations may cause taste and odor issues.
Use chlorine test strips, a digital chlorine meter, or a liquid test kit. Test for free available chlorine (FAC) rather than total chlorine for accurate dosing calculations.
Free chlorine is the active disinfecting form, while total chlorine includes both free and combined chlorine. Combined chlorine has reduced disinfecting power and can cause chlorine odors.
Yes, but only use unscented household bleach containing 5.25% or 6% sodium hypochlorite with no additives. Commercial pool chlorine is more concentrated and efficient for larger volumes.
For pools and spas, test daily during heavy use and 2-3 times per week otherwise. For drinking water systems, follow local health department guidelines, typically weekly or monthly testing.
Always add chlorine to water, never water to chlorine. Wear protective equipment, ensure good ventilation, and never mix different chlorine products. Store in a cool, dry place away from other chemicals.
Factors like water temperature, pH, organic load, and chlorine product concentration affect dosing. Always start with calculated amounts and adjust based on testing results.
For swimming pools, wait at least 30 minutes and retest. For drinking water, wait 30 minutes to 8 hours depending on the application and local regulations before consumption.