Some ceramic water filters (like ceramic candle filters) also use active carbon which absorbs compounds such as chlorine. Filters with active carbon need to be replaced periodically because the carbon is no longer active. Filters without active carbon can be used until they are clogged and the outflow is very low . When the filter gets clogged, it should be cleaned by using clean water flowing in the reverse direction. During this process the residue will be cleared from the filter and the pores will be opened again. The filter can be used again until it is clogged, when the same cleaning process should be repeated.
Inexpensive clay pot filters can be used in developing countries because of their low price and high effectiveness at filtering bacteria and viruses. In some locations, the technology is already in use, but the implementation is still in the early stages. Several NGO's are supporting the implementation.
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