Air purifying, air deodorizing, air humidifying and air filtering apparatus and installations; filters for the aforesaid apparatus and equipment; filters (parts of household installations); water filtering, water treatment, water sterilizing and water purifying apparatus; filters for drinking water; water purifying filters; humidifiers; ionization apparatus for the treatment of air or water; separators for scrubbing air; parts and fittings for the aforesaid goods, included in this class.