Apparatus for filtering drinking water; domestic water filtering apparatus; domestic water filtering units; drinking water filters; filtering units for potable water for domestic use; filters for drinking water; filters for water purifiers; household tap-water filters; water filtering apparatus; water filtering apparatus for domestic use; water filtering units for domestic use; water filtering units for domestic use; water filters; water filtration and purification units and replacement cartridges and filters therefor; water purification filters; water treatment apparatus for use in water purification.