“…Activated carbon is characterized by the presence of manmade and inherent crevices, ridges, surface groups, and other surface irregularities, all of which provide a perfect environment for colonization in macropores; consequently, colonization is denser on such a substrate than on conventional filters [19][20][21][22]. In this connection, bacteriological analysis of water has shown that bacteria settle on the filter material, reproduce on it, and take part in the maturing process.…”