Page 35 - OHS, April/May 2025

Types of Filtration Products
Types of Filtration Products
Th ere is a broad range of stormwater fi ltration products on the market;
Th ere is a broad range of stormwater fi ltration products on the market;
each option is designed to capture pollutants at a diff erent point in a
each option is designed to capture pollutants at a diff erent point in a
stormwater discharge fl ow, and each will remove specifi c pollutants.
stormwater discharge fl ow, and each will remove specifi c pollutants.
Some of the most common types of fi ltering products include:
Some of the most common types of fi ltering products include:
Filtering socks: If the source of the pollution is known, the fi lter
sock can be placed at or around the point source. If the point source is
unknown, it can be used as a perimeter control to cover a large area.
Drain inserts: If the point source is unknown, one of the best
locations to fi lter stormwater is at the drain since that’s the point
where stormwater is diverted.
Dewatering bags and pipe socks: Horizontal discharge pipes or
pumping applications can pose a challenge when removing pollut-
ants. Dewatering bags or pipe socks can be used to remove pollut-
ants from these areas.
When stormwater fi ltration products are installed, it’s important
to routinely sample the discharge. Th is will determine if your fi ltra-
tion products are still eff ectively removing pollutants. Collected sed-
iment, debris, and fl oatables should also be removed from the fi lters.
Treatment Trains
In some cases, a single layer of fi ltration doesn’t get the job done.
Th is is when a treatment train comes into play. A treatment train
is the process of using layers of fi ltration products at various stages
of stormwater drainage. With more fi ltration at various stages, you
can increase the removal percentage of pollutants in your storm-
water. Th is is extremely eff ective when you know the point source
of a stormwater pollutant.
A construction site is a great example of a location where a
stormwater treatment train can be benefi cial. When vegetation
and soil are moved on a construction site, it increases the ability for
sediment and debris, along with many other pollutants, to travel
through stormwater.
To start a treatment train, fi ltration socks are a great fi rst line of de-
fense. Th ey can be used around stockpiles of raw material, as a perime-
ter control around the construction site, and around heavy equipment.
Th e second level of a treatment train would be drain fi lters.
Th ey would be placed over or under the storm drain grate to fi lter
pollutants directed to these areas. Filters will help collect the sedi-
ment and debris that fl ows toward drains.
Th e fi nal location to capture stormwater pollutants before
they’re discharged is outfl ow ports. Dewatering bags and pipe
socks can be used as the last line of defense in your treatment train.
Typically, you’ll want to have the majority of sediment and debris
removed before this point.
Conclusion
Now that you know what an eff ective treatment train looks like,
you can add these methods to your portfolio of ways to meet en-
vironmental responsibilities. Explore your options to fi nd the best
stormwater products to help you comply with EPA regulations and
protect our waterways.
Dan Ankney is Technical Service at New Pig Corporation. He spent
the beginning of his career as an EHS
Coordinator, building his Environmental
and Safety knowledge. He has a Bachelor’s
REFERENCE
1. tinyurl.com/yeh7apd3
degree in environmental, health and safety.
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APRIL/MAY 2025 | Occupational Health & Safety 33