Patent ID: 7465393

Claim:
A method for manufacturing a membrane filter comprising: a hydrophilic filter part which comprises a bundle of hydrophilic elements which are each fixed by at least a first end in a bottom element, such that, during use, water passes the bottom element via said hydrophilic elements; the bundle of hydrophilic elements being wound into a coil shape, such that therein a hollow space is enclosed next to the bottom element; a hydrophobic filter part being watertight and air permeable formed as a portion of one or more of the hydrophilic elements to which is introduced a hydrophobing agent, such that air can pass said membrane filter via said hydrophobic filter part; the method comprising the steps of: fixing a bundle of hydrophilic filter elements by at least a first end in a housing part to be called bottom element, such that said first end of the hydrophilic filter elements is open towards a first side of said housing part and the hydrophilic filter elements extend on the opposite side of the housing part; and subsequently providing for at least one watertight and air-permeable element, in particular a hydrophobic filter element.