// multi-utility computation suite · offline · instant · precise
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sci.chlorine-demand-disinfection Calculator
Calculates chlorine demand from breakpoint chlorination data: demand = dose − residual. The breakpoint (complete ammonia destruction) occurs at Cl₂:NH₃-N molar ratio > 7.6 — water with 1 mg/L ammonia-N needs > 7.6 mg/L Cl₂ to pass the breakpoint.
Inputs
Cl2 Applied Mgl
Reference formula or conversion factor shown for context.
Cl2 Residual Mgl
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).
Ph
Reference formula or conversion factor shown for context.
Temp C
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
Results
chlorine demand (mg/L)
Sample size or count used in the calculation.
CT value (mg/L·min)
The computed numeric or monetary value.
effective CT (HOCl fraction)
Sample size or count used in the calculation.
HOCl fraction
Sample size or count used in the calculation.
CT = C × T | Demand = Applied − Residual
Sample size or count used in the calculation.
pH effect
pH of the solution. Below 7: acidic. 7: neutral. Above 7: basic (alkaline).