Glossary & Terminology

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Absolute filter rating

Refers to the smallest particle size that a filter will trap 100 percent. For example, a 5-micron absolute filter will trap all particles 5 microns and larger. See nominal filter rating.

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Absorption

The process by which filters hold or trap particles and chemicals by absorbing them. Picture a sponge.

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Activated carbon

Carbon that has been specially treated to enhance its ability to trap certain chemicals.

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Adsorption

The process by which carbon filters trap chemicals by holding them on the surface. Picture a magnet holding something on the surface.

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Aeration

The process of exposing water to large amounts of oxygen in order to remove certain kinds of chemicals.

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Aggressive water

Water that, because of its purity, aggressively reacts (chemically) with materials.

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Anion

A negatively charged ion. See also Cation.

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Aquifer

A naturally occurring underground reservoir.

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Backwashing, back flushing

Reversing the flow of water through a filter in order to cleanse it of accumulated particulate matter.

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CA membrane

Cellulose acetate membrane. A type of membrane used in reverse osmosis.

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