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Downspout Filtration  
CleanWay | Downspout Filtration
To control and capture pollutants common to buildings with metal roofs, downspout filters provide an efficient and cost effective solution. Along with metal roofs, many buildings have rooftop equipment that could contribute to metals and oils runoff where downspout filtration is the answer.

If you’re looking for an unobtrusive stormwater filtration system with a small footprint, consider the CleanWay® downspout filter unit. Along with an attractive and compact design, these systems are easy to install and with direct access into the unit, taking test samples and performing maintenance is a breeze.

Available in standard or custom configurations, downspout filters can be connected on the right or left side, depending on your site.

Select from a variety of tested, highly specialized media combinations to capture pollutants of concern. We work with you to identify the right media blend to help meet your site’s specific water quality objectives.

How they work

CleanWay's downspout filter system consists of three major components: the primary rigid strainer, the absorption media section, and the downspout system housing.
  1. A primary rigid strainer constructed of a perforated material with surface area that accommodates flows rated at 125% of the flow of the downspout prior to installation.

  2. The absorption media section incorporates a flexible open mesh fabric envelope containing a specialized media blend. This envelope is suspended from the support assembly and fitted into the basin in such a way that all influent passes through it before exiting and entering the downstream conduit. The combination of gross solids removal via the strainer and the absorption / filtration function of the media section reduce TSS and other pollutants.

  3. The outer downspout filter housing is made of durable 10ga powder-coated steel and is designed to provide easy access to the internal rigid strainer and filter elements via the top lid. The lid has a prop that can be locked in an open position so that a single operator can service the unit either by hand or with a Vactor truck (just like our catch basin filters). There are two levels of outlet openings so that the downspout filter can be run in either a dry (where vector control is a concern) or wet configuration (to increase removal rates with additional contact time).

These filtration units are also commonly referred to as a roof drain filter, a gutter drain filter, rainwater filter units, etc. and are highly effective at removing pollutants from rainwater that carries pollutants that have settled on the roof of buildings which then routes into the gutters and through the downspouts to the storm drain system. The primary concerns are dissolved zinc (which can come from galvanized HVAC equipment on the roof as well as moss inhibitive, and abrasion resistance coatings, along with environmental deposition), dissolved copper and dissolved lead removal (which tend to be carried in environmental deposition from neighboring properties or nearby roadways where copper is found in brake linings and lead is found in tire weights).

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  • High efficiency in a small footprint
  • Attractive, compact design
  • Connected on left or right side
  • Cost effective, simple solution
  • Effectively captures pollutants prevalent on structures with metal roofs
  • Easy access sample port to check performance
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