Glossary & Terminology
- NSF 42 Standard
The National Sanitation Foundation’s standard which tests for the reduction of chlorine, iron, phenol, sulfate, hydrogen sulfide, and zinc, as well as scale control.
- NSF 53 Standard
The National Sanitation Foundation’s standard which tests for the reduction of arsenic, barium, cadmium, copper, fluoride, herbicides, lead, mercury, nitrate, pesticides, selenium, trihalomethane, TCE and VOC.
Water from which most of the dissolved solids have been removed by the process of reverse osmosis. That portion of the water that passes through any RO membrane.
The measure of alkalinity/acidity in water. A pH of 1 to 7 is acidic, 7 – 14 is alkaline, and exactly 7 is neutral.
- Pore size
This refers to the smallest substance that an RO membrane will reject most of. For example, a .001-micron membrane might reject approximately 90 percent of all substances .001 microns and larger.