40 CFR 141.534 - How does my system use this data to calculate an inactivation ratio?
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§ 141.534 How does my system use this data to calculate an inactivation ratio?
Use the tables in § 141.74(b)(3)(v) to determine the appropriate CT99.9 value. Calculate the total inactivation ratio as follows, and multiply the value by 3.0 to determine log inactivation of Giardia lamblia:
|If your system * * *||Your system must determine * * *|
|(a) Uses only one point of disinfectant application||(1) One inactivation ratio (CTcalc/CT
|(2) Successive CTcalc/CT
|(b) Uses more than one point of disinfectant application before the first customer||The (CTcalc/CT