This invention is capable of assuaging the BOD5 of polluted water in the range 250 mg./l for 600 cubic metre per day. This helps reduce more than 90% of the BOD rate and is much cheaper. It costs only 0.96 baht per cubic metre and 3.84 baht per BOD kilogramme unit. This device has already been patented and is widely used both in the private and government sectors. It implements higher technology than any other existing invention and thus can be considered as “the 9th innovation of the world”