Air purifiers; Air purifying apparatus and machines; 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; Environmental control apparatus, namely, particle activators for use in soil remediation, drinking water treatment, municipal and industrial wastewater treatment; Filter cartridges for industrial dust collection systems for use in pulse-jet cleaning; Filters for drinking water; Filters, heaters and pumps sold in combination for use in swimming pools; Gas injectors for disbursing solids and/or liquids for purification and sterilization purposes; Industrial air filter machines; Membrane filter cartridges for the separation of biomolecules in biopharmaceutical production; Sewage purification apparatus; Solar thermal air systems for heating purposes; Swimming pool water cleaning and filtering units; Water closets; Water desalination plants; Water filtering units for aquariums; Water filtration and purification units and replacement cartridges and filters therefor; Water purification, sedimentation and filtration apparatus for clarification, thickening and filtration of water, waste water and industrial water; Water purifying units, for potable water for commercial use; Water treatment equipment, namely, cartridge filtration units; Water treatment equipment, namely, reverse osmosis units