Iowa Irrigation specializes in pond management. When the water quality is improved, the vicious cycle of excessive growth, death, decomposition, and re-release of nutrients is interrupted. This leads to a gradual return of the pond over a few years to the pristine condition that ponds exhibit when man does not introduce excessive nutrients. As this is being accomplished, if the excessive re-introduction of nutrients from other sources can be prevented, the amount of future treatment required to maintain the pond in good condition will be significantly reduced.