The present invention relates to a method of processing a wort stream used in the production of a beer, using at least one reverse osmosis membrane or nano filtration membrane as a filter stage, and at least one treatment stage wherein the method is characterised by the steps of: a) transferring the wort stream into contact with the filter stage, and b) passing water from the wort out of the filter stage as a permeate and retaining required components of the wort in contact with the filter stage as a retentate, and c) transferring the retained components of the wort stream to a treatment stage once carbohydrates in the wort have reached a set concentration level. A method for screening the wort to remove waste products using a screening stage before the wort reaches the filtering stage is also disclosed. The present invention provides a method and apparatus for removing the traditional requirement of the kettle and a whirlpool in the production of wort to be fermented into beer.