Concentration of passed nitrates in elute is biggest when the height of pillar sample is 10 cm that is the con- sequence of making equilibrium in column that is be- cause of coming to new quantity of nitrate solution, constantly moving in direction of washing out. When we compare method of complete flowing out and method of continuous flow we see (Table 3.) the difference in time of nitrate sobbing as well as the difference in concentrations of retained nitrates.