11 Waste water treatment installations; Water filtration apparatus for the deionization of water; Water treatment apparatus for use in industrial and municipal water purification, namely electrodeionization stacks, water purification tanks, water purification units and water purification and filtration apparatus; Electrostatic water treatment apparatus for use in industrial and municipal water purification, namely electrodeionization stacks, water purification tanks, water purification units and water purification and filtration apparatus