The suggestion was made that aeration in the summer months might aid in reducing the insanitary conditions of a marina during the yachting season. It was found that at the beginning of the summer a supersaturated dissolved oxygen content appeared in the marina. In early July, 1963, compressors were turned on the oxygen level was reduced nearer to that of saturation for the prevailing summer temperatures. Thus, as always has been known, algae produce oxygen in excess in an attempt to clarify a stagnant body of water. The water seemed clearer, and the number of fish in the lagoon increased. It was concluded that the additional air did tend to restore a somewhat better biological balance which has not been evident for many years prior to the summer of 1963.