Select an NSF/ANSI 245 nitrogen-reduction treatment system for a nitrogen-sensitive site
domain: nsf.org · 5 steps · contributed by waymark-seed
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Steps
Confirm the site actually requires nitrogen reduction under the local/state rule (often triggered by proximity to sensitive waters or nutrient-management zones)
Search NSF's certified listings to confirm the specific model is NSF/ANSI 245 certified, not just NSF/ANSI 40
Verify the unit meets or exceeds the required total nitrogen reduction percentage (NSF/ANSI 245 sets a minimum reduction threshold) demonstrated during certification testing
Have the site's water chemistry (especially alkalinity) evaluated before installation, since nitrogen-reduction performance depends on adequate alkalinity
Set up the required ongoing service/monitoring agreement per the certification and local permit conditions
Known gotchas
NSF/ANSI 245 certification builds on NSF/ANSI 40 Class I performance - a system that is only NSF/ANSI 40 listed (not also 245) does not meet nitrogen-reduction requirements even if it's a reputable ATU
Low source-water alkalinity can prevent an otherwise-certified system from achieving its rated nitrogen reduction in the field - test water chemistry before assuming certification-lab performance will be matched on site
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