Glossary & Terminology

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PPM

Parts per million. A measure of the amount of a substance in water. Equivalent to milligrams per liter (mg/l).

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Pre/post filter

A secondary filter attached either before the main filter, to prevent particulate matter from entering the main filter; or after, for final “polishing” of water exiting the main filter.

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PSI

Pounds per square inch of water pressure.

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Recovery rate

The ratio of pure water produced to total water used in the process of reverse osmosis.

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Regeneration

A process by which a filter medium is cleansed of accumulated pollutants, such as by reversing the flow of water through it.

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Rejection

The process whereby certain substances cannot pass through a membrane and are drained off.

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Resin

A specially prepared mineral that is used in de-ionization, softeners, and in some kinds of filters.

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Reverse osmosis (RO)

Processes by which contaminants are rejected by a membrane while pure water is allowed to pass through.

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Scale

A hard, whitish buildup of mineral deposits on surfaces that contact water, such as the inside of water pipes or the boiling chamber of a distiller. The white stuff you see on shower heads and faucets.

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Shark Bites

A type of fitting used in water plumbing that one can push the pipe into it and it is held in place without soldering.

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