Varn's Super Defoamer 225 for Alcohol Fountain Systems is Extremely concentrated. Use sparingly! Varn Super Defoamer 225 is formulated for defoaming fountain solution and water mixtures, especially in reservoir tanks on automatic fountain solution proportioning systems. Just 5 to 10 drops is all you need for defoaming 5-gallons/20 Liters of mixed fountain solution and water.