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There are several producers of ceramic candle filters. The product discussed here is the Water4life Gravity Unit ceramic candle filter.

==Construction, operations and maintenance==

When new candles are used, don’t consume the first 5 litres for drinking water. Do not clean the unit and candles every day. Filter candles need to be cleaned when flow rate is very low. Use some water an a piece of cloth to rub the dirt off the candles. Never use soap or other detergents. If the dirt has penetrated the outer layers of the ceramics, scrapping off the outer layer is needed. This can be done by using hard brush. Take care that no crack is introduced. Once a crack is created the water is no longer safe.