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http://www.oilgae.com/algae/har/flo/flo.html Flotation Usually flotation is used in combination with flocculation for Algae Harvesting in waste water. It is a simple method by which algae can be made to float on the surface of the medium and removed as scum. Continuous-flow centrifugation with the classical Foerst rotor is widely used method. This method is reasonably efficient, but sensitive algal cells may be damaged by pelleting against the rotor wall and the method is essentially unselective ; all particles with a sedimentation rate above some limiting value will be collected. http://www.oilgae.com/- website/ blog dedicated to discovering methods and ideas about algae harvesting