The present study concerns the mathematical description for particle fractions during the sedimentation process. The authors have taken into account polydisperse suspension, which is formed during the coagulation process. In water and wastewater treatment, coagulation is a technological stage for chemical treatment. According to this, alum or other chemicals are added to water to form tiny, sticky particles called flocs. The way that the flocs settle is very difficult to describe. Group classification of the flocs may help to define the sedimentation process for post-coagulation suspensions, and may ensure new mathematical equations for this problem. Keywords: sedimentation, polydisperse suspension, coagulation.
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