Check the chart below for the correct Replacement Cartridge for your OMNI Whole House Water Filter. There are filters simply for rust and sediment removal. Some filters will improve taste and odor as well. The CB6 filter will do all of that plus remove Cryptosporidium and Giardia cysts. So choose your desired level of filtration and put in an order today! And remember, we offer three levels of volume discounts on orders of six, twelve, and twenty-four count filters!