Downspout Filtration


  • High efficiency storm filter systems provide excellent pollutant removal in a small footprint

  • Adaptive stormwater filtration designs fit the side of any building

  • Attractive, non-obtrusive, compact design

  • Connects on either left or right side

  • Easy access water sampling port

  • Internal bypass prevents roof flooding

  • High flow rate


  • Effective metals removal that helps achieve regulatory compliance

  • Cost effective solution for filtering rooftop runoff in a small footprint

  • Straightforward design, easy installation

  • Simple and accessible maintenance

Is your rooftop runoff a concern for the pollutant load it carries? CleanWay® Downspout Filtration systems help you comply with water quality regulations that mandate removal of pollutants and heavy metals from rooftop runoff. 

Downspout filters are self-contained, compact units that are easy to install and maintain. They also feature a ready access sampling port to test water quality. 


  • Downspout filters, also referred to as roof drain filters, gutter drain filters or rainwater filters, address the primary concerns of rooftop runoff pollution. This includes dissolved zinc from galvanized rooftop HVAC equipment, moss inhibitors and abrasion resistance coatings, along with environmental deposition of dissolved copper and lead from neighboring properties or nearby roadways where copper is found in brake linings and lead is found in tire weights. 

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

  • Because rooftop runoff can contain many different pollutants of concern, we help you to determine the best media blend for your application.


Downspout Filtration systems consist of three components:

  • 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.

  • Absorption media section incorporates a flexible open mesh fabric envelope with a specialized media blend suspended from the support assembly and fitted into the basin so all influent passes through before exiting to the downstream conduit. The combination of gross solids removal via the strainer and the absorption / filtration in the media section reduce heavy metals, suspended solids, turbidity and other pollutants.

  • Outer downspout filter housing made of durable 10ga powder-coated steel and designed to provide easy access to the internal rigid strainer and filter elements via the top lid. Two levels of outlet openings allow the unit to be run in either a dry (where vector control is a concern) or wet configuration (to increase removal rates with additional contact time).

  • The top lid can be locked in an open position so a single operator can service the unit by hand or Vactor truck.

  • Check out the Downspout Filtration Unit Drawing.