Filters of this type are used when contamination is occurring constantly,  manual cleaning is uneconomic, or the plant filters are extensively automated.

In BollfilterUSA automatic filters, the filter candles, wedge wire candles, or wire mesh candles are automatically cleaned by back-flushing without interrupting operation. This may depend on differential pressure, time, and be carried out using the plant’s own medium.  This could be a compressed-air-supported medium or external medium.