The filtration happens from inside to outside through the filter basket. There is collection of particles on the smooth inner side of the filter basket. Then, as the level of contamination increases, the differential pressure between the contaminated and clean sides of the filter increases.Moreover, when the pressure drop reaches the pre-set trigger point, filter basket cleaning starts automatically. When we reach the differential pressure trigger point, then the gear motor turns past the rinsing unit positioned on the inside of the filter basket.