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About This Item
Full Description
To achieve certification, treatment systems must produce an acceptable quality of effluent during a six-month (26-week) test. Class I systems must achieve a 30-day average effluent quality of 25 mg/L CBOD5 and 30 mg/L TSS or less, and pH 6.0-9.0 spanning six months of testing. System service and maintenance are prohibited during the test period.
Document History
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NSF/ANSI 40-2023
Residential Wastewater Treatment Systems- Most Recent
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NSF/ANSI 40-2022
Residential Wastewater Treatment Systems- Historical Version
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NSF/ANSI 40-2020
Residential Wastewater Treatment Systems- Historical Version
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NSF/ANSI 40-2019
Residential Wastewater Treatment Systems- Historical Version
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NSF 40-2018
viewing
Residential Wastewater Treatment Systems- Historical Version
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NSF 40-2013
Residential Wastewater Treatment Systems- Historical Version
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NSF 40-2012
Residential Wastewater Treatment Systems- Historical Version
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NSF 40-2010
Residential Wastewater Treatment Systems- Historical Version
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NSF 40-2009
Residential Wastewater Treatment Systems- Historical Version
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NSF 40-2005
Residential Wastewater Treatment Systems- Historical Version
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NSF 40-2004
Residential Wastewater Treatment Systems- Historical Version
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NSF 40-2000
Residential Wastewater Treatment Systems- Historical Version
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NSF 40-1999
Residential Wastewater Treatment Systems- Historical Version