What is the NSF 350 Greywater Certification?

Greywater Certification What is the NSF 350 Greywater Certification? Greywater certification through NSF 350 is a rigorous process manufacturers pursue to display the NSF mark on their products. This process includes 26-weeks of continuous third-party testing during which system maintenance or process adjustments are not allowed, a review of design specification compliance, and a satisfactory […]