PLANFILTER

A plane filter which comprises a filter cloth (8) which is from the periphery towards the center at a small angle in relation to the horizontal plane, means (4) for directing the water to be filtered from the periphery onto the filter cloth (8), and a spray pipe (9, 10) rotating below the filter cloth, the pipe being fitted to spray water through the filter cloth in order to detach the dirt which has adhered to it and to transport it over the lower edge of the filter cloth into a drain well (6) located in the center of the filter. In order to increase the capacity of the filter there are, placed on top of the filter colth (8), baffles which slow down the flow of the water and increase the thickness of the water layer. The baffles may be rings (11) placed on top of a circular filter cloth (8) and concentric with it, or a net (13) placed on top of the filter cloth.