11 Filters, membranes, filter and membrane capsules being parts for domestic or industrial installations and for filtering or separating solutions, suspensions, emulsions, foams, aerosols, gas mixtures, smoke, dust, steam or vapours; filters, membranes, filter capsules and membrane capsules for industrial purposes and for household purposes; water filters, membranes, filter capsules and membrane capsules, for use in the following fields: water filtration.