Membrane filters for water filtering apparatus; Water treatment equipment, namely, reverse osmosis units; Household air cleaners; Air sterilisers; Water filtering devices, namely, water purification installations for waste water and sewage consisting of curtains and textile fabrics; Water purification units; Air cleaning units containing an air filter, ultraviolet lights and a photocatalytic filter; Air purifying apparatus and machines; Water filtering apparatus; Air filtering units; Water pu...