It is a water treatment method used to purify industrial waster water to use it again. Industrial waste water contains grease, oils and some toxic chemicals. We clean this industry water and recycle it for further use. Effluent is released by many industries like pharmaceuticals, chemicals and textile while manufacturing their products. So the waste dirty water contains many toxic and non toxic chemicals and it can not be released without treatment. It may affect our environment also. That is why Effluent Treatment Plants are installed in manufacturing industries.