Contech DownSpout StormFilter Installation guide

©2006CONTECHStormwaterSolutions Tollfree:800.548.4667 1of2
contechstormwater.com SingleStageDownSpoutStormFilterOperationandMaintenanceGuidelines
OperationandMaintenance
DownSpoutStormFilter
™
SingleStageUnits
Important:Theseguidelinesshouldbeused
asapartofyoursitestormwater
managementplan.
Overview
The singlestage DownSpout StormFilter™
(DSF) consists of a multichamber 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 builtin ports for viewing
and sample collection to simplify
monitoring.Forhigherlevelsoftreatment,a
secondstagecanbeadded.
One singlestage, twocartridge 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 resuspension of trapped
pollutants in cases where extreme flows
exceedthewaterqualitydesignflow.
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 underdrain
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.

©2006CONTECHStormwaterSolutions Tollfree:800.548.4667 2of2
contechstormwater.com SingleStageDownSpoutStormFilterOperationandMaintenanceGuidelines
MaintenanceGuidelines
ThefiltercartridgescontainedintheDSF
areeasilyremovedandreplacedduring
maintenanceactivitiesaccordingtothe
followingguidelines:
1. Establishasafeworkingareaasper
typicalcatchbasinserviceactivity.
2. Removelid.
3. Turncartridge(s)counterclockwiseto
disconnectfrompipemanifold.
4. Remove4”centercapfromcartridge
andreplacewithliftingcap.
5. Removecartridge(s)fromcartridge
chamberbyhandorwithvactortruck
boom.
6. Removeaccumulatedsedimentvia
vactortruck(min.clearance13”x24”).
7. Rinseinteriorofchamberandvactor
remainingwaterandsediment.
8. Installfreshcartridge(s)threading
clockwisetopipemanifold.
9. Replacelid.
10. Returnoriginalcartridgesto
CONTECHStormwater
Solutionsforcleaningand
mediadisposal.
Mediamayberemovedfromthefilter
cartridgesusingthevactortruckbeforethe
cartridgesareremovedfromthecatch
basinstructure.Emptycartridgescanbe
easilyremovedfromthecatchbasin
structurebyhand.Emptycartridgesshould
bereassembledandreturnedtoCONTECH
StormwaterSolutions,asappropriate.
Note:Customerisresponsiblefor
disposingofmediainaccordancewith
applicableregulations.
Materialsrequiredincludealiftingcap,
vactortruck,andfreshfiltercartridges.
ContactCONTECHStormwaterSolutions
forspecificationsandavailabilityofthe
liftingcap.Theownermayrefreshspent
cartridges.Refreshedcartridgesarealso
availablefromCONTECHStormwater
Solutionsonanexchangebasis.Contact
themaintenancedepartmentofCONTECH
StormwaterSolutionsat(800)5484667for
moreinformation.
Maintenanceisestimatedat24minutesof
sitetime.Forunitswithmorethanone
cartridge,addapproximately5minutesfor
eachadditionalcartridge.Addtraveltime
asrequired.