Wis. Admin. Code Department of Natural Resources NR 810.53

Current through October 28, 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.