10 GAC Granulated Activated Carbon Filter. Removes chlorine, chloramine, VOCs and etc (qty 6). 10 CTO Carbon Block Filter. Removes chlorine, chloramine, VOCs, bad taste and odor. High quality guaranteed (qty 6).50 GPD RO membrane (membrane made in US), qty 1. Post inline filter CL10ROT-33, made by Omnipure (made in USA), qty 3. We highly recommend to change filters every 6 months. Fit most of Reverse Osmosis Systems with standard 10"x2.5" housing.