Filter funnel, analytical test, CN membrane. Capacity: 100ml. Membrane: Gridded. Pore size:0.45um Disposable, sterile filter funnels consisting of a polypropylene upper, high impact polystyrene collar and 47mm cellulose nitrate membrane. Designed for microbiological analysis testing. The grey membranes turns black when wet making it easier to detect and count growing colonies. Upper separates easily from lower for easy access to the membrane. Supplied sterile with six funnel adapters in each case. Funnel adapter allows use with No. 8 stoppers.