4-PACK Of 5 Micron Carbon Block CTO Coconut Shell Water Filter Cartridge 10" by CFS 4 OF 5 MICRON CARBON BLOCK CTO WATER FILTER CARTRIDGES by CFS Activated carbon block is a blend of fine activated carbon, water, and a suitable binder that is mixed and molded then hardened or extruded to a cartridge filter of any size and shape. Carbon block is made of fine coconut shell removing chlorine, odors and tastes of many organic compounds, at the same time it offers a much finer filtration of suspended particles and dirt. Universal Industry Standard size of 9.75” by 2.5” and is compatible with most industry standard RO Filter units. Features: Class 1 Chlorine, Taste & Odor Reduction Dimensions: 9.75” by 2.5” Made with Premium Quality Coconut Shell Activated Carbon 5 Micron Filtration No Release of Carbon Fines Fits all Standard 10" Filter Housings, Reverse Osmosis Systems (Watts, Pentek & Hydrotech) and other Under Sink Systems 5,000 Gallon capacity @ 1 PPM Chlorine with 98% chlorine removal at end of cartridge life. Flow rate: 1 GPM Cartridge is designed for use in Under Sink Filtration & Reverse Osmosis Applications but not for whole house applications. Cartridges are individually shrink wrapped.