Natural processes are specifically recommended for algae removal from the effluents of stabilization ponds and lagoons. Examples are:
Rock filter, intermittent sand filter, floating aquatic plants (Eichhornia crassipes), constructed wetlands subsurface flow system (Typha Sp.), overland flow and electrolytic method (1, 2). The use of electro-coagulation techniques is also developed for final polishing of effluents from these systems and it may be proposed for removal of algae too