Stimulation fluids contain gelling agents which increase fluid viscosity to facilitate proppant delivery. These gelling agents consist of high molecular weight water-soluble polymers which, when hydrated, create a high viscosity solution. These polymers create problems concerning disposal of flow back fluids when incomplete or improper down-hole breaking occurs. The AOTech process has been demonstrated to rapidly reduce the viscosity of hydrated gelling agents by breaking apart the high molecular weight polymer, yielding a lower molecular weight compound with minimal viscosity.  Rapidly reducing the viscosity of the flow back water stream greatly improves the removal of suspended solids and other contaminants, facilitating easier and more economical disposal or reuse in oilfield applications.