Gullywasher - Model 55 Upflow -Biofilter

The heart of our treatment process lies with our gravity-based, dual-stage, upflow Biofilters. They use organic, carbon-negative media to strip out stormwater contaminants. The biochar media strips the total/dissolved metals, BOD, COD, and a limited amount of nutrients from the stormwater.

The first stage treatment container consists of a filter bag made of an industrial grade 10 oz geotextile with forklift straps and under support straps. There is a secondary filter screen located at the container outlet – designed to trap any suspended solids that could potentially bypass the main filter bag.

During the second stage, stormwater is redistributed evenly across the 2nd stage container and flows upwards through the biochar media. This media treats the stormwater through adsorption, ion exchange, complexing, biological, and chelating in an upflow process. The biochar media strips total/dissolved metals, BOD, COD, and a limited amount of nutrients from the stormwater.

Our 55 gallon unit is small enough to fit through 30” doorways and fit into very tight spaces making it one of the most portable treatment systems on the market.

Gullywasher Biofilters are built with service in mind. There are no specialized tools needed to service any part of this BioFilter.

Gullywasher`s Upflow Filter Solutions use a removable insert that can be washed and re-used.

Gullywasher upflow biofilters can be easily located at the end of the downspout to treat your hot spots, catching contaminants off metal roofs before they hit the ground.

We can collect the water via sumps and catch basins and pump the water to this system.

We can utilize virtually any filter media; however, the lab test results are focused solely on the use of filter-grade biochar. Third-party lab results have shown 99.7% removal of metals over a year’s service.