Filtering units for attaching to water faucets; filters for drinking water; filters for fluids, namely, for water and area-water solutions; plumbing fittings, namely, faucet filters; water filtering apparatus; water filtering units for domestic use; water filters; water filtration and purification units and replacement cartridges and filters therefor; water filtration and purification units and replacement cartridges and filters therefor for water faucets; water purification and filtration apparatus; apparatus for filtering drinking water.