// multi-utility computation suite · offline · instant · precise
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eng.chlorination-dose Calculator
Calculates chlorination dose required for disinfection from flow rate, contact time, and target CT value (concentration × time). CT value concept: the product of disinfectant concentration and contact time determines log-reduction of pathogens — CT = 5 mg·min/L achieves 2-log Giardia inactivation.
Inputs
Flow M3 Day
Reference formula or conversion factor shown for context.
Chlorine Demand Mg L
Reference formula or conversion factor shown for context.
Residual Target Mg L
Reference formula or conversion factor shown for context.
Contact Time Min
Duration of the process. Make sure units match the rate inputs (seconds, minutes, or hours).
Results
chlorine dose required (mg/L)
Sample size or count used in the calculation.
chlorine mass needed (kg/day)
The computed mass of the object or substance.
CT value (mg/L·min)
The computed numeric or monetary value.
dose = demand + residual
Sample size or count used in the calculation.
CT for Giardia 3-log inactivation (pH 7, 15°C)
pH of the solution. Below 7: acidic. 7: neutral. Above 7: basic (alkaline).