Air filtering installations; Apparatus for filtering drinking water; Coffee percolators, electric; Filters for air extractor hoods; Filters for drinking water; Filters for fluids, namely, for water and area-water solutions; Lawn sprinkler systems comprising pumps, valves and filters; Plumbing fittings, namely, sink strainers; Strainers for plumbing drains; Swimming pool water cleaning and filtering units; Water filters; Water purification and filtration apparatus