The Doulton W9120145 Rio 2000 6 Pack Ceramic Water Filter Replacement features 6 ceramic candle filters for use in big blue style water filter housing. The Doulton W9120145 Rio 2000 6 Pack Ceramic Water Filters are saturated with silver, which results in the inhibition of bacteria growth. Owing to their self-sterilizing property, these filters are easily cleanable, making them reusable. This filter removes particles to the 0.9 micron level as well as removing bacteria, and cysts. It offers a flow rate of up to 520 gph and its cartridge filter length measures 8?.