Omnipure is recognized throughout the world as the premier manufacturer of inline water filters. Incorporated into every Omnipure filter body design are engineering features that make Omnipure products the best, most cost-effective water filters on the market. The self contained filters are labeled with a model number on the filter body. The first letter(s) of the model number correspond to one of the series listed below. The rest of the number is descriptive of its size, use and contents. For example, an Omnipure inline filter numbered CL10ROT33 is found in the CL-Series. It is a 10-inch filter for use in an RO system and contains T33 media.