55 Upflow Biofilter

With our 55 gallon upflow biofilter you don't have to choose between convenience and effectiveness. Our smaller dual-stage water treatment system can fit through a 30" wide doorway and removes metals, BOD and COD to keep your business compliant with state and federal regulations.

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Proven to Remove up to 99.7% of Metals

Explore our case study of a major semiconductor manufacturer and review the third-party lab results.

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The Upflow Solution

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.

Stage One- Filtration

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.

Stage Two- Metals Removal

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.

Why us?

Easy to Site

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.

Easy to Service

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

Easy to Maintain

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

Biofilter Applications


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.

Pump N’ Treat Applications

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.

Flow Capacity
Max Treated
15 gpm
Ideal Treatment
8-10 gpm
16 gpm
1st Stage
1st Filter
10-oz geotextile
2nd Filter
Multi-weave Filter Cloth
2nd Stage
Organic Media
Amount of Media
4 cu. ft.
Filtered Collection
BioChar Mix 2
6.67 ft3

Biofilters on the Brain?

Us too! Reach out and connect with us to talk about your business needs and how our biofilters can help you meet your compliance needs without breaking the bank.

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