Water conditioning units for residential purposes; reverse osmosis modules and membranes therefor; water purification units and systems consisting of clarifiers, electro deionization membranes, condensate polishers, vacuum degasification units, ultra filtration units, ultraviolet sterilizers, ion exchangers, acid and caustic regeneration units, reverse osmosis modules and membranes therefor, forced draft decarbonator units, filters, chemical feed systems consisting of chemical storage receptacles, pumps, gravimetric and volumetric feeders, water-jet eductors, impellers, timers, alarms, injection nozzles, and level gauges, sold as a unit with automatic controls and instruments to monitor operating parameters of the units and systems; electrochemical liquid purification units for use in the industrial, commercial and municipal sectors; Water filtering units for domestic, commercial and industrial use; waste water purification units; water purifying units for potable water for domestic, commercial and industrial use; filters for fluids, namely, fluid separation units for water; recycling units, namely, fluid purification units; water treatment equipment, namely, filter cartridges, disposable cartridge filters for industrial use; water treatment equipment for household use, namely, water softeners and water conditioners; water filters, namely, media filters and depth filters for removing sediments, iron, sulfur, tastes and odors from water; reverse osmosis water purification; depth filter units and depth filter cartridges for liquid and air filtration for domestic, industrial, and commercial use; air filters for industrial installations, namely, disposable cartridge filters