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The process of bringing the microflocs formed by coagulation together into even larger aggregates or flocs is called flocculation. The flocculation process follows the coagulation process and it requires gentle mixing and sufficient retention time to allow the large flocs to form. During flocculation, the floc size of the particle aggregates continues to build and grow through additional particle collisions and interactions with added synthetic polymers. High molecular weight polymers called flocculants are added to the solution to help bridge, bend, and strengthen the flocs. These larger flocs are more buoyant and easier to float. Once they have reached a sufficient size, they can be skimmed off the surface of the DAF flotation unit.