Proposed revisions to:
NSF/ANSI 42: Drinking Water Treatment Units – Aesthetic Effects (42i127r1)
NSF/ANSI 53: Drinking Water Treatment Units – Health Effects (53i152r1)
NSF/ANSI 58: Reverse Osmosis Drinking Water Treatment Systems (58i106r1)
NSF/ANSI 401: Drinking Water Treatment Units – Emerging Compounds /
Incidental Contaminants (401i32r1).
The normative annexes of several standards provide instructions for labs to reach filter capacity during testing for consistency in preventing premature filter plugging. An issue paper (see Referenced Items) noted that the current language works well for chemical injection test rigs, but does not address tank style test rigs. The proposed updates add language to allow the use of a mechanical filter prior to the test unit that does not impact the chemistry requirements of the standard.
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