Polypropylene upper body and 47 mm Cellulose Nitrate membrane. Low-cost disposable, sterile filter funnels for microbiological analysis testing of water quality, food/beverages, raw material, sterility testing and finished product quality. 33522-05 features gray, water quality cellulose nitrate membrane with white grid. The membrane turns black when wet, making it easier to detect and count growing colonies. Membranes meet U.S. Environmental Protection Agency (EPA) certification requirements for water quality work. Upper separates easily from lower for easy access to the membrane. Funnel adapter allows use with No. 8 stoppers. Six funnel adapters included with each case.
