This Inline Pre/Post Membrane Filter Cartridge is made with premium coconut shell based activated carbon. Inline post carbon filter is known as polishing filter, because it is usually the last stage of any standard reverse osmosis circuit. Being made of high quality coconut shell, it stabilizes the water tasting qualities and further removes any traces of bad tastes and odors. This filter is often used as a Reverse Osmosis (RO) inline post filter. It clips on to the membrane housing and filters the water after the bladder tank, acting as a polishing filter. This Inline Pre/Post Membrane Replacement Filter Cartridge is compatible with:  Omnipure (CL10RO T33), Pentek (GS 10), as well as most other brands of water filters. T33 IS MADE WITH PREMIUM COCONUT SHELL BASED ACTIVATED CARBON. REMOVES CHORINE, CHLORAMINES, BAD TASTE ODORS, & VOCS. STANDARD SIZE Flow Rate: 0.75 GPM (2.84 L/min.) 1/4″ Quick Connect Fittings built-in on both ends