the incorporation of that gas into solution in an aqueous solution the injection of gas causes several important effects within the housing and the surrounding aqueous material the gas which is in solution will provide a hydrogen acceptor in biochemical reactions and or one or more essential nutrients for the growth of specific bacterial cultures to be grown within the housing excess amounts of said gas which do not go into solution will provide upward movement due to their buoyancy and cause an up flow through all parts of the housing in a method often referred to as an air lift action phase two of the process involves the growth of bacterial colonies on a media conducive to said growth the specific species of bacteria will be dependent upon the species introduced initially into the system as well as the environmental growth factors within the system said bacterial growth shall be at a rate so as to provide a constant supply of bacteria for additional phases as well as to maintain a population of bacteria within the bacterial growth media of the unit phase three of the process is the sloughing of the bacterial growth off of the growth media and into suspension within the aqueous material said sloughing takes place due to the combined scouring effect of the injected gas which is not in solution the upward flow of the aqueous material and movement of the bacterial growth media the sloughing action is performed to such a degree so as to allow continuation of colonies for phase two to continue as well as providing sufficient amounts of bacteria to accomplish tasks as indicated in phase four phase four of the method involves the removal of bacteria within the aqueous material to.