National Sanitation Foundation
What is NSF (National Sanitation Foundation)?
NSF stands for National Sanitation Foundation. A U.S. testing body that certifies water-treatment products. NSF/ANSI 58 covers residential RO performance; 61 covers material safety for drinking-water contact.
Related glossary terms
- POU
A compact RO unit installed at the kitchen tap or under-counter — purifies the water at the exact point it is consumed. Typical residential or small-office system.
- POE
A whole-house or whole-building RO unit installed where water enters the property — treats every tap downstream.
- OEM
A company that builds finished water-purification systems (and resells them under its own brand) using component-grade RO elements supplied by Hi-Tech.