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The general awareness regarding microbes has greatly increased over the past few decades. However, little is known about their distant cousins, ‘Protozoans and Metazoans’, more popularly known as ‘higher life forms’. Both these categories of organisms are of great value to industrial effluent treatment. Microorganisms constitute 95% of population in an ideal activated sludge ,of which 4 % of this microbial population consist of higher life forms. Although these higher life forms contribute very little to the removal of organic nutrients, their presence however greatly enhances the clarity of the water and provides an indication of effluent condition (Eg. Toxicity,organic load, dissolved oxygen etc.).