The DR-Multi-Vent deodorizing filter is a self breathable filter that’s applied to odour issues at sewage pumping stations and treatment plants and is suitable for air quantities of 300 m3/h, with a maximum of 500 m3/h. The DR-Multi-Vent has, in recent years, proven to be a robust and reliable filter. Due to its round shape, the air is distributed over the media bed. As a result, the medium is optimal and uniform consumed. The DR-Multi-Vent is made of stainless steel and therefore resistant to vandalism. Because of its lack of electrical parts the filter is easy and low in maintenance. The odor filter serves as a de-aeration filter to capture the smell of air displacement by rising of the water level. The de-aeration filter is mainly implemented in sewage pumping stations. The pumping well should be airtight.