Water softening apparatus; parts for water purification apparatus, namely, polyphosphate dispensers, polyphosphate and silicate dispensers; polyphosphate dispensers with filters for the treatment of water; parts for water purification apparatus, namely, replacement cartridges for polyphosphate dispensers; water filters for use in central heating systems; water treatment filters; water filter cartridge units in the nature of water filtering units for domestic use, water filtration and purification units and replacement cartridges therefor, replacement water filter cartridges; water softening installations; water filters for industrial and household use; water filters; filters for sanitary hot water distribution apparatus in the nature of hot water heaters, hot water tanks, electric beverage heaters, tap water faucets; sanitary plumbing fixtures, namely, shower sprayers, sink traps, water conservation plumbing fixtures in the nature of aerators, and heating systems, namely, heating systems for residential and commercial buildings comprised of biomass burners, boilers, valves, pipes, manifolds, solar panels, control panels, switches and electrical wire, all sold as a unit, heating systems composed primarily of tubes, pipes and manifolds through which warm or high temperature water circulates, indoor radiant heating systems, and components and fittings therefor; water filtering apparatus; boilers being parts of central heating installations and components therefor; thermostatic valves as parts of heating installations; regulating accessories for water apparatus and for water pipes