Treats as much water as a gallon of other diluted pond dyes Decreases sunlight penetration into the depths of your pond Safe for all aquatic & domestic life Pond dyes also improve the aesthetic of your pond by coloring brown water a more pleasing color Ultra-Concentrated Pond Dye – 1 qt. Liquid decreases sunlight penetration into the depths of your pond. Also improves the aesthetic of your pond by coloring brown water a more pleasing color. Our fish-safe Ultra-Concentrated Pond Dye – 1 qt. Liquid treats a one acre body of water up to 6-ft deep. Pond Dyes limit sunlight penetration to the bottom of the pond. By using Bjornsen Pond Management Ultra-Concentrated Pond Dye along with MuckEater Pelleted Pond Bacteria, PondFit Beneficial Pond Bacteria, and Phosphate Binder you will create a natural and proactive approach to pond management. Our specially formulated colors (Blue, Midnight Blue, and Black) are very deep and rich.