Water conditioning units; apparatus for treating water, namely, ultraviolet sterilization units and replacement cartridges and filters therefor, reverse osmosis units and replacement cartridges and filters therefor, water filtration units and replacement cartridges and filters therefor, water purifying units and replacement cartridges and filters therefor, water softening units and replacement cartridges and filters therefor; water purifying apparatus and machines for introducing chemicals into a water supply; sanitary apparatus, namely pumps for introducing chemicals into a water supply; water purifying apparatus and machines, namely pumps for introducing chemicals into a water supply; peristaltic pumps for introducing chemicals into a water supply; automatic and semi-automatic water purifying apparatus and installation systems for introducing chemicals into a water supply; automatic and semi-automatic water purifying apparatus and installation systems for introducing chemicals into a water supply for horticultural or agricultural use; plumbing fittings, namely valves; regulating accessories for water supply, namely, metered valves; water control valves for faucets