CT Calc
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Contact time needed to inactivate giardia and viruses, from the tables in EPA 815-R-99-013.
Disinfectant
Free chlorine
Chlorine dioxide
Chloramine
Ozone
Pathogen
Giardia
Viruses
Temperature (°C)
0 – 25
Residual (mg/L)
≤ 3
pH
6 – 9
Logs of inactivation
0.5
1
1.5
2
2.5
3
Enter a temperature, residual and pH to see the contact time.