// multi-utility computation suite · offline · instant · precise
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sci.chlorine-demand-CT Calculator
Calculates CT value (concentration × time in mg·min/L) for disinfection of drinking water and checks against EPA CT requirements for pathogen inactivation. 3-log Giardia inactivation at 10 °C requires CT = 165 mg·min/L for free chlorine — turbidity below 0.3 NTU is required before CT-based disinfection.
Inputs
Ct Required Mg Min L
Reference formula or conversion factor shown for context.
C Residual Mg L
Reference formula or conversion factor shown for context.
Q M3 S
Volume of fluid per unit time. Used to size pipes, pumps, and ducts.
Contact Tank M3
Three-dimensional space occupied (m³ or L). 1 m³ = 1,000 L.
Results
hydraulic retention time (min)
The computed duration or time value.
CT achieved (mg·min/L)
Sample size or count used in the calculation.
CT required (mg·min/L)
Sample size or count used in the calculation.
log inactivation credit
The value at the specified point or condition.
compliance
Sample size or count used in the calculation.
WHO CT for Giardia (2-log, 5°C)
Reference formula or conversion factor shown for context.