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Filtration
is a process whereby pollutants, primarily solids in suspension,
are removed from water by physically trapping them in media
containers called filters. Media can be sand, gravel, or alternative
material that is permeable and allows water to pass through.
Filtration consists of two common types: 1) single-pass filtration
and 2) multi-pass filtration. In single-pass filtration,
the effluent flows through the filter only one time before
being discharged for additional treatment or final dispersal.
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