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PureGen Water Filter Cartridge Sediment 10 x 2.5-inches Wound Polypropylene Micron: 1, 5, 10 Features Removal of sand, silt, dirt and rust particles Polypropylene material conforming to FDA standard Absolute assurance of filtration efficiency High chemical resistance Low pressure drop Directions Place cartridge in an appropriate housing and flush for a minimum of 10 minutes prior to use. Use only with micro-biologically safe and tested water FYI: What is MICRON? Answer: It is the construction of fiber, how fine or finer the material and depending on the usage. You can use 1, 5, or 10 micron depending on the quality of water you are using. For deep well or untreated water you need the most fine 1 micron to filter all dirt and bacteria, but for commercial water like NAWASA, MANILA WATERS, and MAYNILAD, since these water is already treated, either use 5 or 10 to eliminate dirt and bacteria.