The waste water flows through perforated filter elements made of stainless steel, while contaminants are held back. Solid matter is picked up directly at the bottom of the channel without necessarily requiring a base step. The filter elements form a continuous filter belt which is cleaned by a brush at the upper deflection point. The cleaning process is assisted by a series of jets working in proportion to the screenings load. Tines located on every 5th screening element prevent build-up of rolling matter in front of the screen and ensure that large matter is removed.
As a result of the half-round shape of the filter elements and the arrangement of the cleaning
brush at the upper deflection point, the distance between the brush and the filter element
remains constant.
Official, independent tests have shown that FSM screens with a hole size of 6 mm approx. filter out double the amount of screenings as stage screens with 6 mm gap size. The screenings retention figure of an FSM screen with 6 mm holes is of the order of 76%.
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