UltraClear pH Lower. After testing for pH, you find that the pH is too high. This liquid product will adjust the pH back to neutral by adding small amounts until the desired pH is restored. Decreases pH quickly and safely. Longer lasting formula with tri-buffering activity. Use for ponds or aquariums. Use 5 ounces for every 1000 gallons of water for ponds or 1/2 ounce for every 100 gallons.