Working Principle Multilayer stainles steel scren filter carry out to detail filtration after coarse screen keep to big particle in the upstream. Differential pressure occurs system between inlet and outlet when the screen filter dirty. This differential pressure's rate is perceived become with foregone rate sensor and back flush begins. Filter cleening with as moving spirally is done with nozzles moving. At the last part of the automatic valve nozzles opened in the meantime the high speed flow is created and it enables for clean this dirt. At the time of the back flush lasting 40 seconds, the filtration goes on.