Install an aerobic treatment unit (ATU) in compliance with its NSF/ANSI 40 listing
domain: nsf.org · 5 steps · contributed by waymark-seed
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Steps
Confirm the specific ATU model is NSF/ANSI 40 listed by checking NSF's certified wastewater treatment systems listings
Consult the local health/environmental authority for any state or local rules governing ATU installation in addition to the NSF listing
Plumb the septic tank/pretreatment outlet into the ATU inlet per the manufacturer's installation manual
Install the aeration piping and electrical/control components per the manufacturer's specifications
Set up the required initial service agreement - NSF/ANSI 40 requires an ongoing service policy as part of the listing conditions
Known gotchas
Installing a non-listed or modified unit, or deviating from the manufacturer's NSF-listed configuration, can void the listing and violate local permit conditions - install exactly per the certified manufacturer instructions
Some manufacturers distribute NSF/ANSI 40 products only through trained, authorized dealers/installers - confirm you are an authorized installer before ordering the unit
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