Biosart® 250 Funnels have been specifically designed for microbiological testing of pharmaceuticals, food, beverages, water and other liquids. Biosart® 250 Funnels are sterile, ready to use 250 ml plastic funnels and they are designed to be placed onto the bases of the Combisart vacuum manifolds. A Sartorius gridded membrane filter is placed on a stainless steel filter support. A Biosart® 250 Funnel is simply fitted on and the sample is filtered. The funnel is made of polypropylene and is sufficiently elastic for optimal sealing with a bayonet-type closure. Graduations are marked at 50, 100, 150 and 200 ml for sufficiently exact sample volumes. The large inner diameter ensures a high flow rate. The conical form allows a thorough rinsing of the system subsequent to filtration. No liquid is retained in the filter funnel.