(1) This section applies to treatment technologies for Tier 3 greywater irrigation systems.

(2) All proprietary greywater treatment products used to treat light greywater shall meet the requirements of NSF/ANSI Standard 350-1, 2011, of the National Sanitation Foundation International (NSF), "Onsite Residential and Commercial Graywater Treatment Systems for Subsurface Discharge."

(3) All proprietary treatment products used to treat dark greywater shall meet the requirements of NSF/ANSI Standard 40, 2009.

(4) All proprietary treatment products shall bear the NSF seal of approval indicating that the product meets the requirements of NSF Standard 350-1 or NSF Standard 40 as applicable.

(5) Public domain treatment technologies may be used to treat greywater if the department has developed recommended standards and guidance for the technologies.