Ultra Clear DeFoamer. Quickly eliminates unsightly foam in Koi ponds, fish ponds, water gardens, fountains & statues. Leaves water clean and clear by increasing surface tension of water. Works in seconds.Safe for fish, plants & wildlife.Can be safely used with all other UltraClear products.Convenient 16 ounce & gallon bottles available.Continued foaming on pond surface may indicate that there is an undesirable concentration of undissolved organic sludge or sediment on the bottom of the pond. Read about (click here) UltraClear Sludge Digester for treating this problem. Dosage: Use 2 ounces per 1000 gallons of pond volume to be treated.