Water conditioning apparatus, as well as parts and accessories therefor within this class; apparatus within this class for treating water, as well as parts and accessories therefor; apparatus for dosing water with additives being sanitary apparatus as well as parts and accessories therefor; apparatus for dosing water with sanitizing additives being water supply apparatus, as well as parts and accessories therefor; pumps for dispensing additives to water being sanitary apparatus; pumps for dispensing sanitizing additives to water being water supply apparatus; peristaltic pumps, within this class; metering and dosing apparatus for dosing water to maintain the quality of the water within defined limits being sanitary apparatus; metering and dosing apparatus for dosing water with sanitizing additives to maintain the quality of the water within defined limits being water supply apparatus; automatic and semi-automatic dosing systems for introducing additives to water in pools and spas being sanitary apparatus; automatic and semi-automatic dosing systems for introducing sanitizing additives to water in pools and spas being water supply apparatus; automatic and semi-automatic dosing systems for introducing additives to water supplies for horticultural or agricultural use being sanitary apparatus; automatic and semi-automatic dosing systems for introducing sanitizing additives to water supplies for horticultural or agricultural use being water supply apparatus; valves within this class for controlling fluid flow