Abstract: The present invention relates to a polyelectrolyte multilayer (PEM) membrane comprised of at least one bilayer, wherein the bilayer is comprised of a layer of a polymeric polycation and a layer of a polymeric polyanion. Furthermore, present invention relates to methods for the production of these PEM membranes by layer-by-layer deposition and the use of these PEM membranes for the decontamination of liquids, preferably water.

Abstract: The present invention relates to a method for the production of a positively charged membrane. Furthermore the present invention relates to a positively charged membrane obtainable by the methods of present invention and the use of these positively charged membranes.

Abstract: The invention relates to a method for forming a membrane holder for applying in a tube filter, by mutually connecting a number of cassettes of V-shaped cross-sectional form, wherein a plurality of cassettes are placed successively and connected to each other in longitudinal direction in a row. The V-shaped cross -section of each cassette can herein be defined by two walls and a bridge piece located therebetween, wherein each wall has a number of cut-away portions. The cassettes can be mutually connected such that a cut-away portion in a wall of the one cassette is bridged by a full wall part of the other cassette. The cassettes can be mutually connected close to the base of their V-shaped cross-section, for instance by being snapped together. The invention further relates to a membrane holder obtained by applying this method, to cassettes for use in the method and in the membrane holder, and to a tube filter in which such a membrane holder is applied.