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DownSpout StormFilter
SingleStage Units
Important: These guidelines should be used
as a part of your site stormwater
management plan.
Overview
The singlestage DownSpout StormFilter™
(DSF) consists of a multichamber plastic
unit that can contain up to two StormFilter
cartridges. By configuring the StormFilter
cartridges with various filter media, the DSF
is designed to remove pollutants such as
soluble zinc and other metals from rooftop
runoff.
The DSF is installed above ground,
occupying a small footprint (2.5' x 5'), and
is easily integrated into most existing
downspout configurations. The system can
be equipped with builtin ports for viewing
and
sample
collection
monitoring. For higher levels of treatment, a
second stage can be added.
One singlestage, twocartridge DSF unit
can treat runoff from roof areas up to
14,000 square feet. The DSF is also
designed with an internal high flow bypass
to minimize resuspension of trapped
pollutants in cases where extreme flows
exceed the water quality design flow.
©2006 CONTECH Stormwater Solutions
contechstormwater.com
Operation and Maintenance
™
to
simplify
Tollfree: 800.548.4667
Single Stage DownSpout StormFilter Operation and Maintenance Guidelines
Design Operation
The DSF is installed as the primary receiver
of roof runoff. Runoff is directly discharged
to the DSF cartridge chamber by the
existing downspout system. Once in the
cartridge chamber, polluted water ponds
and percolates horizontally through the
media in the filter cartridges. Treated water
collects in each cartridge's center tube from
where it is directed by an underdrain
manifold to the outlet pipe on the
downstream side of the overflow weir and
discharged.
When flows into the DSF exceed the water
quality design value, excess water spills
over the overflow weir, bypassing the
cartridge chamber, and discharges to the
outlet pipe.
Applications
The DSF is an affordable, easily
maintained solution for treating rooftop
runoff from industrial facilities, warehouses,
and commercial buildings. Its modular and
changeable cartridges allow it to be
upgraded to meet changing removal
requirements without requiring purchase of
additional equipment.
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Summary of Contents for Contech DownSpout StormFilter
- Page 1 One singlestage, twocartridge DSF unit can treat runoff from roof areas up to 14,000 square feet. The DSF is also designed with an internal high flow bypass to minimize resuspension of trapped pollutants in cases where extreme flows exceed the water quality design flow. ©2006 CONTECH Stormwater Solutions Tollfree: 800.548.4667 1 of 2 contechstormwater.com Single Stage DownSpout StormFilter Operation and Maintenance Guidelines ...
- Page 2 Maintenance Guidelines Media may be removed from the filter The filter cartridges contained in the DSF cartridges using the vactor truck before the are easily removed and replaced during cartridges are removed from the catch maintenance activities according to the basin structure. Empty cartridges can be following guidelines: easily removed from the catch basin 1. Establish a safe working area as per structure by hand. Empty cartridges should typical catch basin service activity. be reassembled and returned to CONTECH Stormwater Solutions, as appropriate. 2. Remove lid. Note: Customer is responsible for disposing of media in accordance with 3. Turn cartridge(s) counterclockwise to applicable regulations. disconnect from pipe manifold. Materials required include a lifting cap, 4. Remove 4” center cap from cartridge vactor truck, and fresh filter cartridges. and replace with lifting cap. Contact CONTECH Stormwater Solutions for specifications and availability of the 5. Remove cartridge(s) from cartridge lifting cap. The owner may refresh spent chamber by hand or with vactor truck cartridges. Refreshed cartridges are also boom. available from CONTECH Stormwater Solutions on an exchange basis. Contact 6. Remove accumulated sediment via ...
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