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NSF/ANSI 244-2022
Supplemental Microbiological Water Treatment Systems - Filtration
The point-of-use (POU) and point-of-entry (POE) systems addressed by this standard are designed to be used for the supplemental microbial control of specific organisms that may occasionally be present in drinking water (public or private) because of intermittent incursions.
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NSF International [nsf]