Usage Tips:OUTSTANDING ADVANTAGES - Compared to melt blown filter cartridge, string filter is best choice to filter water with lots of sediment. FOUR dirt-holding capacity, DOUBLE rate, service life than pp sediment filter.STANDARD DIMENSION - universal string wound filter cartridge fits 10 inch filter housings,as prefilter of reverse osmosis(RO) systems and water filtration, variety of commercial and industrial applications - 6 PackFUNCTION - Remove 99% particles, silt, sand, rust and other undissolved particles in dirty water. the first line of defense in the filtration system, your water using appliances and plumbing for water, water quality and taste.FEATURES - Unique structure increase dirt holding capacity, polypropylene material center tube increase pressure resistance.100% Polypropylene material, non-toxic and tasteless.LIFETIME - For better water quality, recommended replace TWO or THREE a year, depending on the quality of the water source and application type. Recommended change out differential pressure is 30psi(2.1bar).Colour:WhiteMaterial:Cotton threadSize:25.4cmPackage Contents:6* Water Filter CartridgeOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.