Soap bubbles don't belong in your hot tub. Keep your spa free of foam and full of sparkling clean water courtesy of leisure time's concentrated foam down suppressant. This concentrated formula can help prevent unwanted foamy bubbles from appearing in your spa. Compatible with chlorine, bromine, ozone, and biguanide sanitizers, simply apply half-an-ounce of product to your spa and repeat the process until your spa water is clear. Continual foaming can mean a calcium imbalance, or that your spa water needs changing.