Directions: to prevent foaming, squirt a small amount of foam out directly on the surface of the water. Do not use more than 1/2 teaspoonful at a time. Repeat if foaming begins to occur. To eliminate existing foam, squirt a small amount of foam out directly on the surface of the foam. Do not use more than 1/2 teaspoonful at a time. Apply when the spa/hot tub is in operation. Wait 10 Min. If foam has not subsided, repeat treatment