The purpose of the demonstration plant at Glenwood was to determine whether or not the Oxidation Channel type of sewage treatment as developed in Holland will remove more of the plant nutrients from the effluent than is possible with the more conventional types of sewage treatment. One of the principle investigators visited a number of these plants in Europe and came to the conclusion that these plants had the unique feature of assimilating much of the nitrogen and phosphate into microbial protoplasm that could be removed from the system before these ingredients were again released into solution through a breakdown or decomposition of the microorganisms involved.