Doulton® Ceramic Water Filter Buying Guide

This guide is designed to help you choose the right product for you, from our Doulton® Water Filter Range.

Filter Grades

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 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 effects of scale build-up.

doulton water filter grades

Filter Performance


doulton water filter performance

Candle or Cartridge Format?

There are two ceramic filter formats: Candle and Cartridge. The format you need will depend on the type of filter housing you are using and the flow rate you require.

Candles have a domed end and a plastic mount on the top to fix them into the filter housing. All Doulton® and British Berkefeld® filter housings use candle format filter elements.

Ceramic filter candles are available in:

  • 2 standard diameters: Slimline: 2 inches/49 mm. Imperial: 2¾ inches/67mm
  • 2 standard lengths: 7 inches/177mm 10 inches/254mm.

Cartridges (OBEs) have a plastic mount and rubber washer at both ends. They are designed to fit industry standard 10-inch filter housings.

Cartridges are manufactured at a standard length of 9 ¾”/248mm.

Plus two standard diameters: Slimline: 2 inches/49mm Imperial: 2¾ inches/67mm

Water treatment cartridges allow the removal of additional contaminants from your drinking water.

They are compatible with the under-counter and counter-top range of housings and can also be used in the DUO™ housing alongside your choice of ceramic filter candle.

Sediment & Particle Pre-Filter In areas of high sediment, this pre-filter will remove sediment and particles down to 5 microns in size.

Cleansoft™ Pre Filter Protects against the damaging effects of hard water by using the Cleansoft™ limescale reduction cartridge. This will reduce hardness in drinking water and the unpleasant ‘chalky’ taste that hard water can have.

Fluoride Pre-Filter The fluoride reduction cartridge reduces unwanted naturally occurring and added fluoride to safe levels in your mains supplied drinking water.

Element & Grade Availability

element Grade Availability

Typical Candle Flow Rates 49mmØ

Typical Candle Flow Rates

Typical Cartridge Flow Rates

Typical Cartridge Flow Rates

You can find out more on the New Doulton Brochure

All specifications on this page are from the official Doulton site, for more about the specifications, visit the Douton website.