air binding. A situation where air enters the filter media. Air is harmful to both the filtration and backwash processes.
Air Binding
Air Changes Per Hour (ACH)
The movement of a volume of air in a given period of time; if a house has one air change per hour; it means that the air in the house will be replaced in a one-hour period.
 See also: Organism, Absorbed dose, Chamber, Organic compound, Chlorine
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