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flocculating bacteria. This type of bacteria adds density which promotes faster settling. The <br /> flocculating bacteria are the brown clusters in the microphotograph below. <br /> Another type of structural growth of bacteria is referred to as filamentous bacteria. These types <br /> of bacteria attach to each other only at the ends and tend to settle much slower than the <br /> flocculating type. The filamentous bacteria are the thin "stringy" structures in the photograph <br /> below. <br /> When this combined biological mass has enough density to settle in the clarifier, it tends to act <br /> as a filter, collecting smaller pieces of suspended material and removing it from the water. <br /> Flocculating ;4X , V, z <br /> Bacteria <br /> fiY <br /> ,. Filamentous <br /> Bacteria <br /> I <br /> Photograph Curtesy of Class A Training Manual Ohio EPA <br /> Microphotograph of Flocculating and Filamentous Bacteria <br />