Aquarium filters; Chlorinating units for water treatment; Filters and filtering devices for air and gas conditioning; Filters for water filtering apparatus; Fitted liners for hot tubs or spas; Irrigation sprinklers; Lawn sprinkler systems comprising pumps, valves and filters; Metal cylindrical chamber and screen for use in filtering and removing settleable solids from liquid; Plumbing supplies, namely, sink strainers; Strainers for plumbing drains; Swimming pool chlorinating apparatus; Water filtration and purification units and replacement cartridges and filters therefor; Water filtration apparatus for the deionization of water; Water purification and filtration apparatus; Water purification, sedimentation and filtration apparatus for clarification, thickening and filtration of water, waste water and industrial water