HT Foam Away breaks up existing foam instantaneously in spas, hot tubs, and whirlpools. HT uses a specially formulated high concentration that requires so little to be effective that it can best be used with a spray applicator targeting only the foaming areas. RECOMMENDED USE To Prevent Foaming: shake well and disperse no more than a capful of Foam Away onto the surface of the water. To Eliminate when foaming occurs: shake well and disperse one capful where foaming exists or use a spray activator lightly on surface of water. If foaming persists after 30 minutes repeat procedure.