Metpure 100% melt-blown polypropylene. This filter is made with a radial multi-gradient tight-packed structure polypropylene fiber designed to maximize impurity holding capacity and to provide an optimal filtration result and service life. For drinking water applications. Food grade. BPA free. Do not use where water is microbiologically unsafe or of unknown quality without adequate disinfection before or after the filter. Flush the filter with at least 3 gallons of water prior to usage or if contains carbon, until black carbon residue disappears. Use proper filter housing matching the specs of this filter. Temperature rating range at 40-160 F. 5 micron. Service life: 6-12 months.