11 Thickening and de-watering machines for use in treatment of liquids including water, industrial effluent and sewage;Water treatment equipment, namely, cartridge filtration units;Water treatment equipment, namely, chemical sterilization units;Water treatment equipment, namely, reverse osmosis filtration units;Water treatment equipment, namely, ultraviolet sterilization units; Water treatment equipment, namely, filters and conditioners made of precious and semiprecious gemstones and other elements, clays, and minerals