The Sterasyl ceramic is fitted with both an activated carbon block and an ion exchange resin insert to produce the Ultracarb™. Among other things, activated carbon is very effective at removing chlorine and organics from water. The ion exchange resin specifically removes lead from water. Ultracarb™ is designed to be used in pressure filters (on a mains water supply), not in gravity filters. Benefits: Ultracarb™ has all the benefits of Sterasyl™ (removal of particles, pathogenic bacteria, cysts etc.) with additional chlorine, organics and lead removal capabilities Dimensions Thread 1/4 bsp Length 5/8 " Filter Height 10" diameter 2"