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You are here: Home / Explanatory Dictionary / Fixture Unit

Fixture Unit

an arbitrary unit assigned to different types of plumbing fixtures, and used to estimate flow rate requirements and drain capacity requirements.

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Water Quality Specialists

Definitioner

Flow Rate: the quantity of water a regenerant which passes a given point in a specified unit of time, often expressed in gallons per minute.
Capacity: an expression of the quantity of an undesirable material which can be removed by a water conditioner between servicing of the media, i.e., cleaning regeneration or replacement, as determined under standard test conditions. For ion exchange water softeners, the capacity is expressed in grains of hardness removal between successive regenerations and is related to the pound of salt used in regeneration. For filters, the capacity may be expressed in the length of time or total gallons delivered between servicing.