DEVICE FOR WASHING OFF CONTAMINANTS FROM FILTERING SURFACE Russian patent published in 1999 - IPC

FIELD: drinking water supply system; regeneration of filtering surfaces of infiltration water intakes. SUBSTANCE: device has drive and looser made in form of flat toothed inclined knife with support shield arranged under knife and vertical pillars installed between knife and shield in staggered order. Screw-like grooves are made on inner surface of inclined support shield. Grooves turn into spiral before first pillars in direction of flow of contaminated layer. EFFECT: increased efficiency of infiltration construction. 3 dwg