Proposed revisions to:
NSF/ANSI 42: Drinking Water Treatment Units – Aesthetic Effects (42i109r5)
NSF/ANSI 53: Drinking Water Treatment Units – Health Effects (53i130r5)
NSF/ANSI 401: Drinking Water Treatment Units – Emerging Compounds/Incidental Contaminants (401i22r5)
The proposed revisions will harmonize the current operational cycles and sampling specified in NSF/ANSI 42, 53, and 401. Revision 2 addressed comments received during the r1 ballot (11/30/20) to specify a minimum run time per day and clarify the language for the rest time. Revision 3 addressed additional comments received from a straw ballot of r2 (6/16/21) and added an exemption for holidays and weekends, specified the collection time after 1 hour instead of the 3rd cycle for rests longer than 2 hours, and allowed an operational cycle of up to 10%-on / 90%-off for POU devices. Revision 4 addressed comments received in the r3 ballot (10/6/21) and removed the minimum 7-hr run time and associated minimum test time exceptions. R4 did not include changes to the “Chloramine reduction testing” section, which many commentors noted were erroneously included in the r3 ballot. Revision 5 addresses comments received in the r4 ballot (10/28/22) and changes the rest time from 8 hours to a minimum of 8 hours and clarifies that effluent samples shall be collected at or beyond the percent of the capacity indicated. |
