The Doulton W9130113 MegaCarb "Doultimate" has a Sterasyl ceramic outer shell impregnated with carbon "black ceramic" with a carbon block core.

All the features of the Doulton MegaCarb Sterasyl and Carbosyl plus chlorine, trihalomethane, lead and organics reduction, along with activated carbon block with ATS resin.   

Features:

• Impregnated black ceramic outer shell
• Designed to remove suspended solids, pathogenic bacteria, chlorine, aluminum and organic chemicals
• High-porosity ceramic shell impregnated with highly stable silver
• Micro pores are lined with active carbon to provide a working surface area in excess of 10,000 square meters
• Outer shell made of Carbosyl and inner carbon block core of Ultracarb, giving it much greater VOC and chemical reduction claims
• Lead Reduction of > 98.3%
• Chlorine Reduction of > 97%
• High Trihalomethane and Polyaromatic Hydrocarbon reductions
• The candle is fitted with a threaded plastic cap on one end