The Polycap GW capsule filter is specifically designed to filter ground water samples before dissolved metal analysis. The US Environmental Protection Agency (EPA) and local Departments for Environmental Protection protocols specify filtering ground water samples with a 0.45 µm filter when analyzing dissolved or suspended metals (EPA Method 3005). Specifically designed with field sampling in mind, the Polycap Ground Water sampling capsule can be used as a convenient in-line filter unit. Connects directly to outlet of a sampling pump. Easy to use. Suitable for filtration procedure outlined in EPA Method 3005 for ground water analysis. Filter Media: 0.45 µm Poleythersulfone (PES). Filtration area: 600 sq cm (93 sq in). Max Pressure: 60psi (4.1 bar). Water Flow Rate: 60L/min. Fittings: Stepped Barb for 1/4 to 3/8 inch Tubing. Sold Individually. Whatman #: 6714-6004.