Apparatus and instruments for use in the purification, separation and sterilization of liquids and gases used in the biotechnology, pharmaceutical, medical, biopharmaceutical and food and beverage industries; Bioreactor for use in the treatment of {indicate use, e. g., wastewater and waste}; Desalination installations; Filters for water filtering apparatus; Marine sewage holding tank vent filters; Purification installations for sewage; Waste water purification apparatus, installations and tanks; Waste water purification units; Water filtering units; Water filtration and purification units and replacement cartridges and filters therefor; Water filtration apparatus for the deionization of water; Water purification apparatus; Water purification filters; Water purification units; Water purification, sedimentation and filtration apparatus for clarification, thickening and filtration of water, waste water and industrial water; Water softening apparatus and installations; Water treatment equipment, namely, water filtration units; Water treatment equipment, namely, water filtration units and reverse osmosis units; Water treatment unit for aerating and circulating water