The gravel filter ensures the simple coarse cleansing of the biogas. The gas flows through a gravel filter layer during which dirt, foam and condensate droplets are separated out.

In the case of normal debris levels, the gravel can be cleaned by water injection via the cleaning nozzles or by flushing without the need to open the filter.

In the case of normal debris levels, the gravel can be cleaned by water injection via the cleaning nozzles or by flushing without the need to open the filter.