Water filtration and purification units and replacement cartridges and filters therefor; External ballast and bilge water filtering and absorbing device for use in a local containment area for removing aquatic nonindigenous species, oil and other contaminants from the effluent; Water filtering units for aquariums; Oxygen generator for processing water by increasing oxygen content in the water; Aquarium filtration apparatus; Aquarium lights; Aquarium heaters; Aquarium filters; Ultraviolet lamp...