The Sterasyl™ ceramic is fitted with an activated carbon block insert which contains lead removal media to produce the Ultracarb™. Among other things, activated carbon is very effective at removing chlorine and organics from water. Ultracarb™ is designed to be used in pressure filters (on a mains water supply), not in gravity filters.
Ultracarb™ has all the benefits of Sterasyl™ (removal of particles, pathogenic bacteria, cysts etc.) with additional chlorine, organics and lead removal capabilities.
The ceramic of a filter candle is cast in such a way that it has one domed closed end. The other end of the ceramic is open. This open end is closed off with a food grade plastic mount, which enables the candle to fit into a filter housing. Water passes from the outside of the candle to the inside, leaving particles of dirt, bacteria, etc. on the outside of the ceramic. The filtered water then passes out of the candle through the mount.