O-ACE-sis Defoamer 1 qt. (Pack of 12)Defoamer has been formulated specifically for eliminating foaming in pool and spa water without altering the water chemistry or imposing any adverse effects upon the water or swimmers. The unique formulation of this antifoam is designed to rapidly disperse throughout the body of water treated, to promptly eliminate existing foam and remain as a residual in the pool or spa to prevent subsequent foam formation for an extended period of time. Therefore,