FIELD: sanitary appliances. SUBSTANCE: water-closet cleaning system has metering device placed in rinse water tank and provided with chamber and water inlet/outlet devices incorporating tube attached to closest side wall of chamber bottom part. Chamber communicates with rinse water tank through water inlet/outlet devices; water-closet cleaning mixture is located in its bottom part. After water discharge mixture is thinned, passed to water inlet/outlet devices, and admitted to rinse water tank. Top part of metering device chamber is made for introduction of cleaning mixture; bottom part is arranged so that water admitted to metering device chamber forms turbulent flow which ensures thinning or dissolution of cleaning mixture contained in bottom part of chamber. EFFECT: reduced amount of water-insoluble materials in cleaning mixture; improved system immunity to changes in water flow turbulence throughout entire service life. 7 cl, 8 dwg, 7 tbl, 4 ex
