Doulton Ultracarb 10" Water Filter Candle, 2-pack (W9123053) Candles have a domed end and a plastic mount on the top to fix them into the filter housing W9123053 cleanable filter elements are designed to remove suspended solids, pathogenic bacteria, hydrogen sulphide, and lead At the heart of every Doulton ceramic filter is the "Sterasyl" silver impregnated ceramic micro filter