We carry a KX Matrikx Ceramikx SC 20-185-125-083 water filter that fits what you have described. This KX 20-185-125-083 ceramic water filter can be found here:
http://www.waterfilters.net/KX-Matri...r_p_0-535.html
The Ceramikx SC 20-185-125-083 ceramic drinking water filter by KX Industries has a 0.2 Nominal Micron Rating and a 0.5 Absolute Micron Rating.