275 Rain Garden

The Gullywasher 275 Rain Garden is a stormwater purification filter capable of sustaining drought tolerate plants in its topsoil. The 275 BioDown Rain Garden has a flow capacity that can reach up to 15-GPM.

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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 Downflow Solution

The Gullywasher 275 BioDOWN Biofilter consists of a single 275-gallon chemical tote with a filter box for larger suspended solids, three high-quality media stages and Gullywasher Goose Necked Effluent Discharge Outlet Piping to maximize metals removal.

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Why us?

Easy to Site

Gullywasher's 275 Rain Garden consists of one 275 gallon totes at 50 inches deep and 48 inches wide. The filter is highly portable and can be assembled in a day. Plants are locally sourced.

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's 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.

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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