Vertical screen is a compact and simple unit used forseparation and handling of screenings in sewage treatment plants as well asindustrial sites. The vertical screen combines sieving, washing and pressingfunctions in one unit.Waste water is screened through the lower sieve part of theunit installed inside a channel or a tank. The separation can be done with aperforated plate or with a wedge wire. The sieving element is shaped as atrough equipped with a spiral inside, conveying the captured separatedscreenings. The spiral is fitted with a brush inside the sieving through toprevent clogging.The enclosure contributes to a good working environment andit gives a good conveying ability. Inside the conveying section the screeningsare washed and conveyed to the discharge end on top. The washing water, used towash out the organics from the screenings, is added in the opposite directionto the spiral movement.