Aquarium filtration apparatus; Filters for drinking water; Hand held shower heads; Sanitizing apparatus for linens using ultraviolet light, ozone sterilization and low pressure techniques; Sewage purification installations; Strainers for plumbing drains; Tap-water purifying apparatus; Waste water purification units; Water purifying units, for potable water for domestic, commercial and industrial use; Water treatment equipment, namely, reverse osmosis filtration units; Water treatment equipmen...