Raw water enters from the inlet manifold to the coarse screen, trapping larger particles that could interfere with the filter cleaning mechanism-in vertical models, large, and heavy particles are separated by gravity. Then water flows IN-OUT through the wave wire screen, trapping in the inner screen surface bigger particles than the filtration degree.
Clean water flows out through the outlet manifold. Particles build-up creates a filter cake that increases the pressure differential between inlet and outlet, and this activates the cleaning cycle when the pre-set point is reached.

Clean water supply is not interrupted when the cleaning cycle is activated. The cleaning phase starts with the opening of the drain valve, that creates a pressure gradient between the pressurized inner filter and the atmosphere. At the same time, the suction nozzle scanner spirals along the complete inner surface of the screen.
As a result the pressure difference, a high velocity Suction Effect is created at the inlet of the nozzles, making the water flows OUT-IN through the filter element and vacuuming all the particles retained on the screen surface.