【10" Universal Replacement Filter】:The 5 micron 10" x 2.5" PP and carbon block compound filter is suitable for most under sink filtration system,three-pillar RO filter system,RV water filtration,whole house filtration system,countertop drinking water filter and catchment system,they are all with standard 10-inch fiter housing. 【2-Stage Deep Filtration】:The 10-inch compound filter's outer layer is high-precision polypropylene for removal large particle contaminants(rust,lead,heavy metals,chemical impurities,and sand),internal layer is high adsorption coconut shell activated carbon block for effectively reduce chlorine,taste,odor and fluoride.So ensuring you get much safer and better tasting water. 【Safety Outer Layer Material】:The outer layer of the compound filter is made of 100% pure polypropylene material, tested against NSF42 standards, BPA free. There is no fibers shedding because of unique melt-blown technology to avert the re-contamination of drinking water. 【High Absorbing Internal Layer Material】:Our compound filter internal layer is made of 100% coconut shell activated carbon block,eliminate up to 99% of chlorine,bad taste and odor,meet NSF Standard 42.Carbon is well known for its unique absorbing ability,a pound of carbon is able to provide up 125 acres of filtering surface area,sintering technology ensures high absorbing capacity. 【Long Service Life】:If the water quality is not very good,the outer PP layer can effectively filter some large particles in the water,which is a good protection for the inner layer of carbon block,compared with only carbon block material cartridge,the service life of this cartridge will be longer. The package include: 10"x2.5" Polypropylene and Carbon Block Compound Filter