The activated carbon used has been processed by acid-washing and wind-selection and the end caps are fixed with special PP layer instead of general non-woven cloth. So no carbon fines coming out. GAC is made from organic materials with high carbon contents such as wood, lignite, and coal. filters are much more tightly packed than GAC filters means that the blocks filter out far more contaminants. Whereas some contaminants may be able to escape the loose carbon found in GAC filters, Effectively reduce unwanted tastes, odor, and chlorine Absorbs chlorine, halide, organic contaminants, odors, and other impurities that contribute to bad tasting water. This filter reduces chlorine taste & odor, dirt, sediment, sand, silt, rust and corrosion, and other particles QUICK & EASY INSTALLATION: Fits most housings that accept standard 20-inch x 2.5-inch water filter cartridges.