To guarantee a consistently high quality of beverages, routinely microbiological checks are carried out in the companies. The classical microbiological test methods require five to seven days and depending on the product matrices only small sample volumes can be analysed. For difficult or non filterable drinks currently no reliable analytical method is available. With a newly developed method it is now possible to isolate microorganisms from large sample volumes, viscous and solid-laden fluids easy and quick. The advantages of the method are the detection of trace contaminations due to large sample volumes, closed anaerobic conditions to identify strictly anaerobic microorganisms, easy handling and detection of spoilers in difficult or non filterable drinks.