The article presents a proposal of sedimentation model and considerations upon interactions between solid particles. The author demonstrates a computer program for simulations and visualizations of sedimentation processes, which is described by the proposed model. This program works in an interactive and semi-automatic mode, it allows to trace the influence of changes of the particulars parameters of the model on final result described by the final concentration. This program is located in the website http://kutios.imir.agh.edu.pl/mbanas.