These speeds are adjustable using clamps.

According to this method, the sample is placed in a vessel 2 in which the solution is mixed. A title solution of acid, acid salt or other component is poured into a vessel with a capacity of 15-20 liters. This solution is filled with a vessel 2 with a capacity of 0.6-2 liters, in which a sample is tested. After filling the vessel, the solution flows into a vessel 3 with a capacity of 15-20 liters. The rate of receipt of the solution into the vessel 2 should be equal to the rate of expiration from it. These speeds are adjustable using clamps.