Doulton® and British Berkefeld® ceramic filter elements are available in 6 grades. The grade you ultimately choose will depend on which contaminants you want to remove from the water. At the heart of every Doulton® and British Berkefeld® water filter candle is a Sterasyl ® silver impregnated ceramic microfilter.
The incorporation of silver locked within the ceramic structure inhibits the growth of bacteria on the filter, eliminating the need for boiling. By incorporating activated carbon in the form of granular carbon or carbon block, the Sterasyl ® ceramic can also be produced in Super Sterasyl® , Supercarb ® and Chlorasyl® grades which combine the advantages of ceramic and carbon treatment within a single filter element.
At the top end of the product range the ATC Super Sterasyl ® and Ultracarb® candles have an additional ion exchange media which reduces Lead and other harmful heavy metals.
The Supercarb SI ® and Ultracarb SI® candles also incorporate a slow release scale inhibitor to reduce the unwanted eects of scale build-up.