Wis. Admin. Code Department of Natural Resources NR 810.53

Current through September 30, 2024
Section NR 810.53 - CT table for viruses when using free chlorine

CT Values for Inactivation of Viruses by Free Chlorine

Log Inactivation
Temperature, °C 1.0 pH 2.0 pH 3.0 pH 4.0 pH
6 - 9 10 6 - 9 10 6 - 9 10 6 - 9 10
0.5 3 23 6 45 9 66 12 90
5 2 15 4 30 6 44 8 60
10 2 11 3 22 4 33 6 45
15 1 8 2 15 3 22 4 30
20 1 6 1 11 2 16 3 22
25 1 3 1 7 1 11 2 15

Wis. Admin. Code Department of Natural Resources NR 810.53

CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10.