Aquarium filters; Fibrous filtering media for general industrial use in the purification of air and industrial fluids; Filters for fluids, namely, for water and area-water solutions; Sewage purification installations; Water filtering apparatus; Water filtering units for aquariums; Water filtration and purification units and replacement cartridges and filters therefor; Water purification machines; Water purifying units, for potable water for commercial use; Water purifying units, for potable w...