Description: 0.22 m pore size, used for filtration of inorganic water solutions Made of refined nitrocellulose Hydrophilic and non-toxic; Diameter: 25mm/ 1.0inch Very even pore size, high porosity, no media shedding, thin thickness, less resistance, fast filtration and minimal adsorption Used for filtration of bacteria from liquids, gases, oils, beverages, sprinkles, electronic instruments, etc., can also be used as a test for particles and bacteria Specification: Certified to meet Standard Methods for the Examination of Water and Wastewater requirements. Pore Size: 0.22m Color: White Diameter Outside: 25mm/ 1.0inch Package Includes: 200 Pieces Inorganic Filter Membranes Sheets in One Box(3 Pack) Note: This product is flammable, should be sealed, moisture-proof and fireproof when stored.