Cartridge Filter

Within the scope of water treatment, filtration is a mainly physical process for removal of suspended solids from liquids. The liquid to be filtrated flows through a filter medium, which results in the suspended solids being retained by this filter medium. A cartridge filter (in case of certain designs also: candle filter) is a vessel for filtration, with an arrangement of filter cartridges serving as filter medium. Filter cartridges are available in different designs and material, for example melt-blown cartridges made of PP or wound cartridges made of cotton. With increasing service life, the differential pressure between the filter inlet and out increases for a given volume flow, as more solids are being retained within the filter medium. Eventually, the filter medium needs to be either backwashed or replaced. Filter cartridges are usually replaced, certain types are within limitations also suitable for backwashing.