Raw water enters the filter inlet through the coarse screen which protects the cleaning mechanism from large particles. Then water passes through the fine screen, trapping dirt particles which accumulate inside the filter. Clean water flows through the outlet.
The gradual dirt buildup on the inner screen surface causes a filtration cake, with a corresponding increase in the pressure differential across the fine screen. A pressure differential switch senses the pressure differential and when it reaches the pre-set value, the cleaning process begins.
