Fluid separation units for industrial use in a wide variety of industries; fluid concentration units for industrial use in a wide variety of industries; fluid recycling units for industrial use in a wide variety of industries; filter apparatus used for filtering solids from gases and liquids or filtering liquids from gases, and for filtering one immiscible liquid from another for industrial use in a wide variety of industries; spirally-wound elements or cartridges contained within a tubular plastic sleeve for concentrating products and removing impurities in fluid treatment systems for industrial use in a wide variety of industries; water conditioning units for residential purposes; reverse osmosis modules and membranes therefore for industrial use in a wide variety of industries; water purification units and systems consisting of clarifiers, electro deionization systems, condensate polishers, vacuum degasification units, ultra filtration units, ultraviolet sterilizers, ion exchangers, acid and caustic regeneration systems, reverse osmosis systems, forced draft decarbonator units, filters, chemical feed systems and bulk storage units, sold 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