Ceramic 10" x 2 1/2" cartridge, to fit our standard size housings. This Ceramic Cartridge is rated at 2 liters per minute flow and is suitable for all water sources. If you are on an untreated water supply and do not use a UV system, we strongly recommend the use of this ceramic cartridge as a minimum for ultra safe drinking water. Suitable for 10" STD size housings. Rated for E-Coli, Cholera, Shigella, Salmonella, Klebsiella, Cysts, Giardia. Please note we still recommend that this filter cartridge has a minimum of 40 PSI water pressure and must have a 1 micron prefilter to protect it from sediment prematurely blocking it.