DescriptionFoam Free instantly brings spa foam down -- the fastest and most effective hot tub defoamer you can buy. Use it whenever persistent foam is a problem, and to prevent new bubbles from developing in your spa. Ideal anti-foam solution for swimming pools, ponds & fountains too. Instantly brings spa foam down Concentrated formula 16 oz. bottle Product notes: Advanced formula helps prevent new foam from forming. Will not harm equipment, clog filters, or affect water balance.