Water softeners (apparatus); Water softening apparatus; Water softening installations; Water softening machines; Water treatment apparatus for water softening; Apparatus for water softening; Installations for water softening; Apparatus for softening water; Apparatus for descaling water; Apparatus for decalcifying water; Apparatus for controlling the flow of water to water closets; Apparatus for controlling the flow of water to urinals; Apparatus for water supply; Bacteriostatic water treatment installations; Boilers for hot water supply installations; Cooling installations for water; Devices to treat water to prevent deposits in sanitary installations; Devices to treat water to prevent deposits in cooking apparatus; Installations for conditioning water; Installations for the treatment of drinking water; Installations for the treatment of industrial waste water; Installations for the treatment of water used in swimming pools; Installations for water filtering; Water treatment apparatus; Water treatment units