This paper provides the information about theoretical and experimental studies of the process of solid mineral water impurities coagulation at its mixing with aluminum sulfate coagulant solution in contact uniform bed layer with grain size of 10, 30 and 50 mm. It is shown that the values of velocity gradient and Camp-criterion, which together with coagulant dose determine the flocculation efficiency, are the functions of specific surface area ? of coarse-grained bed pore space. Experimental comparative assessment of the efficiency of coagulating natural water with kaolinite clay particles with volume concentration Co=(1,11-1,15).10-4 at its mixing with aluminum sulfate solution was carried out in two ways: by means of the mechanical mixer in free volume, as well as in coarse-grained bed layer by the clarification effect at subsequent settling of treated water.\r\n It is established that to achieve maximum clarification effect at ?>130 m-1 the required values of Camp-criterion in case of using coarse-grained bed are 1,5-3,9 times lower in comparison with mechanical mixing method. At that coagulant doses can be reduced by 1,2-2 times. It is shown that when specific surface area of coarse-grained bed pore space increases from 76,2 to 390 m-1 and time of water contact with coagulant in bed pore space increases, the effect of water clarification by settling becomes more significant.

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