ACTIVATED CARBON FILTER, CERAMIC FILTER ELEMENT AND WATER PURIFICATION SYSTEM COMPRISING BOTH FILTERS

摘要

A particulate activated carbon containing particles of water insoluble ash in an amount of at lest 1 % by weight as determined in accordance with ASTM 2866 is described. The activated carbon is suitable for use in water filters. Also described is a porous ceramic filter element (4) in which a proportion of the pores are partially occluded to give pores having an effective size across their largest dimension which is smaller than their true size. A water purification system (1) comprising an activated carbon filter and a porous ceramic filter (3) element (4) as described which are connected in series so that in use water passes sequentially through the activated carbon filter and then through the ceramic filter element have advantageous properties.