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The flow rate of the Doulton and British Berkefeld ceramic filter can be easily renewed by simply brushing its outer surface with a stiff toothbrush, plastic brush or soft scouring pad under running water. As the top layer of ceramic and the contaminants are brushed off and flushed away, a new layer becomes available. With the Sterasyl candle/cartridge this process can be repeated over 50 times and or when the diameter of the slimline element reaches 1.75/44 in./mm. Supersterasyl, Ultracarb and Supercarb candles/cartridges should be changed every 6-9 months as their carbon media will get exhausted sooner than the ceramic.

If filter has not been used for period of two days or longer the first 2 qts./litres should be wasted and let fresh water supply into the filter.

  • Carefully remove candle from the unit and handle it as any fragile ceramic.
  • Using a soft toothbrush or soft scouring pad (3M Scotch-BiteĀ® or similar), scrub the ceramic filter under running water or in a bowl of water. Always brush away from threaded mount, taking care not to contaminate the mount. Never use soap, detergents or steel wool.
  • Be sure that sealing washer/s is properly seated before reinstalling it.

If you accidentally drop the candle and did not brake to ensure the integrity do the following test.

  1. First the filter needs to be air dried for at least 24 hours.
  2. Submerge it into water container while holding a finger over the outlet to keep the
    air inside.
  3. If there is a crack the trapped air would exit through it and you would see bubbles indicating replacement.

Suggestions: Wear rubber gloves when cleaning. Cover the threaded mount with plastic and a rubber band or the candle O ring.