Once you understand nature is ...

Once you understand nature is always in balance but man is not the problem can be resolved by using nature not man's chemicals or machines. The situation  natural or runoff is out of balance. Given time nature will flush itself out. If you desire to accelerate the balancing process then simply copy natures biological functions. In this particular case excessive organic compounds causing overgrowth and low levels of oxygen. As defined in science manuals bacteria become stressed and die adding to this problem. Of the 3 microbial groups the DNA realm is useless. Only the RNA group has the proper genetic code for reducing ALL organic compounds into their elemental state. Blooms disappear, excessive growth, and as a bonus an abundance of oxygen is made available to finish the balancing process. The species name is Archaea. They do not make oxygen. Just make it more available. As in all things natural the cost is unbelievably low. Also 100% success for the last 5 billion years.  detail info available.