Ceramic filters have long been used as a natural filter media because of their simplicity and efficiency in filtering out contaminants found in water. Henry Doulton is credited with inventing the modern form of the ceramic candle in 1827. Due to his success in treating infected water, by 1846 Doulton ceramics grew into the leading manufacturer of water filtering devices. Henry Doulton was later knighted for his outstanding work that lead to the creation of one of today’s most reliable water filter candles.
The small pore size and complex pore structure of the ceramic media makes it ideal for removing particles and pathogens from water, especially bacteria, protozoa and cysts. A great advantage of ceramic filters is that they can be cleaned, which implies a longer service life. Thanks to this aspect, these filters are considered a long-term investment at a low cost. Another important advantage of these types of filters is that they can be used in pressure filters as well as in gravity filters.
Compared to other filtration systems, ceramic filers do no remove healthy minerals from water, nor do they add any chemicals or other foreign substances to it, not even in trace amounts. Ceramic filters are made of 100% natural elements, which results in an all-natural filtration technology.
Although they are highly efficient in filtering out impurities, ceramic filters do not remove chemical contaminants found in water. To compensate for this, ceramic filter candles like the Doulton Ultracarb are fitted with activated carbon to remove chlorine and organic materials. The ion exchange resin is used to remove lead and heavy metals. The Doulton Ultracarb filter candles have an absolute filtration rating, creating a highly effective barrier against bacteria and contaminants.
Doulton filter candles have silver locked within the ceramic structure, which has bacteriostatic properties preventing bacterial grow-through, and confers self-sterilising properties to the filter candle.
Due to their incontestable efficiency, the Doulton filter candles are also used as a complementary filter in ultraviolet water filters, or as a pre or post filter in reverse osmosis systems.
Apart from the candle shaped ceramic filters, there are also pot shaped types of filters as well. These have a receptacle where the untreated water has to be poured in this upper receptacle and passes through the filters into the lower receptacle, which is fitted with a tap, where treated water can be accessed. Currently, the most widely used design for the pot style filters is the Potters for Peace design.