Glossary & Terminology

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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.

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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.

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Oxidizing filter

A filter that removes pollutants from water by chemical reaction.

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Ozone

A toxic form of oxygen that is used to disinfect water.

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Particulate

Particles in water.

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Permeate

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.

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pH

The measure of alkalinity/acidity in water. A pH of 1 to 7 is acidic, 7 – 14 is alkaline, and exactly 7 is neutral.

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Pollutant

A substance in water that is harmful or otherwise undesirable.

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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.

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PPB

Parts per billion. A measure of the amount of a substance in water. One part per billion is equivalent to one billionth of a gram per liter.

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