reverse flow method

In applications where the majority of the contaminant is larger than the pore size of the filter media, most of the contaminant will remain on the surface or very near to it. In these instances, the elements may be cleaned by simply reverse flowing liquid or gas through the element. This can be done while the element is in the housing or it can be done externally. Typically, a high reverse flow (at least 2 times the forward flow) for a short duration provides good cleaning. The fluid used to reverse flow must be clean or filtered so as not to plug the filter media from the reverse flow direction.

For fibre and mesh cartridges, reverse flow differential pressure should not exceed 1bar unless a backflushing guard is provided, when it can be increased to 3bar. Pleated cartridges are provided with a backflushing guard as standard and the cylindrical cartridge has an optional guard. Due to their robust construction, powder cartridges can tolerate reverse flow differential pressures up to 50bar.