11 Apparatus and instruments for use in the purification of liquids and gases used in the food industry; Desalination apparatus; Electrostatic water treatment apparatus for use in the food industry and water from cooling towers used in industrial processes; waste water treatment tanks; Waste water treatment apparatus; Waste water treatment tanks; Water conditioning units; Water purification units; Water purification, sedimentation and filtration apparatus for clarification, thickening and filtration of water, waste water and industrial water; Water treatment apparatus for use in the food industry and water from cooling towers used in industrial processes and for removing organic components; Water treatment equipment, namely, water filtration units; Water treatment unit for aerating and circulating water; Waste water purification units