The monograph consists of 3 main chapters, introduction, conclusion and lists of references. The water treatment plant of small capacity is taken as an object of study. The subject of the study is the processes of water purification by electrocoagulation followed by thin-layer sedimentation. At the same time the preparation of dense and quick-sediment suspensions is carried out in mixing and flaking chambers (KPiH).The book can be used by engineering and technical specialists, design organizations, as well as a wide range of researchers.