I CT Values (mg·min/l) for Cryptosporidium Inactivation by Ozone

Section 611.TABLE I   CT Values (mg·min/ℓ) for Cryptosporidium Inactivation by Ozone Log Credit Water Temperature (°C) ≤ 0.5 1 2 3 5 7 10 15 20 25 30 0.25 6.0 5.8 5.2 4.8 4.0 3.3 2.5 1.6 1.0 0.6 0.39 0.5 12 12 10 9.5 7.9 6.5 4.9 3.1 2.0 1.2 0.78 1.0 24 23 21 19 16 13 9.9 6.2 3.9 2.5 1.6 1.5 36 35 31 29 24 20 15 9.3 5.9 3.7 2.4 2.0 48 46 42 38 32 26 20 12 7.8 4.9 3.1 2.5 60 58 52 48 40 33 25 16 9.8 6.2 3.9 3.0 72 69 63 57 47 39 30 19 12 7.4 4.7 A supplier may use the following equation to determine log credit between the indicated values: Log credit = (0.0397 ´ (1.09757) Temp(in °C) ) ´ CT BOARD NOTE:  Derived from the table at 40 CFR 141.720(b)(2) (2012).