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→Concentrated underground flow
==Concentrated underground flow==
==Concentrated underground flow==
This type of pretreatement is dominated by proprietary systems, some of which have undergone verification under the [http://etvcanada.ca/ Environmental Technology Verification (ETV) Canada] program.
This type of pretreatment is dominated by proprietary systems, some of which have undergone verification under the [http://etvcanada.ca/ Environmental Technology Verification (ETV) Canada] program. Pretreatment devices suited to concentrated underground flow, or pipe flow include the following:
* Oil and grit (hydrodynamic) separators
* Manhole baffles
* Isolated chamber row filters
* Membrane filters
* Media filters
<br>
Membrane and media filters may also be used as the last facility in a treatment train, so downstream of LID facilities, where warranted by receiving water sensitivity.
<br>
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