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→Types of filtration
==Types of filtration==
==Types of filtration==
Two common types of filter media used in stormwater treatment are granular media, such as sand, and membranes:
Two common types of filter media used in stormwater treatment are granular media, such as [[sand]], and membranes:
'''Granular media''' is a multilayer lattice or matrix that traps solids as water flows through the tortuous channels in the media. Clogging may occur when solid particles form a film or cake on top of the filter or accumulate within the media channels to the point where the channels become occluded.
'''Granular media''' is a multilayer lattice or matrix that traps solids as water flows through the tortuous channels in the media. Clogging may occur when solid particles form a film or cake on top of the filter or accumulate within the media channels to the point where the channels become occluded.