The paper presents the results of the experiment on the separation of the solid phase from the sewage disposed to the household sewage treatment plant. On the basis of the results the modification of the treatment plant's technological chain was proposed by the appliance of the additional device - Aquatron separa-tor, which uses the Coanda effect, for solid phase separation from the sewage. The results of the model laboratory analyzes on the separation efficiency were the ba-sis for this proposition. The research was carried out for the changeable drop of the inlet pipe (1,0-5,0%), different volume of the sewage and the solid phase con-tent. The research results showed the possibility of 94,9-97,3% reduction of the suspended solids' load.