Keep Your Entire Lake or Pond in Crystal Clear Condition and Free of Excessive Nutrients, Sludge, Contamination and Odors! It's So Easy! Simply Drop the Convenient Packets into Your Water Once a Month! Select Your Product Based on the Severity of Your Condition ***Don't Forget Dye for Your Pond, Lake or Lagoon! ***Safe for all fish, Water Lilies and other decorative plants Professional Pond Dye's Temporarily Block Sunlight to Greatly Enhance the Effects of Bacterial Treatments Seed Germination is Reduced and Subsurface Growth is Slowed While Offering a Realistic Appearance to Your Water.