Check the listing for details. CrystalClear PondTint Blue. Condition: New. Listed at 23.99 USD. CrystalClear® PondTint™ is a non-toxic pond dye designed to help keep water sparkling clean and cool. It turns your pond an alluring shade of blue to help photosynthesis from occurring within your pond. This will help keep algae from forming, provide safety for fish from predators and will help keep the water cooler on hot summer days. If a pond does not have significant plant coverage, it is a good idea to use PondTint™ in the hot summer months to shade the pond. CrystalClear® PondTint™ is a mild dye that is not overpowering, so that you will still be able to see your fish. *Helps keep water clear *Filters sunlight to cool pond water *Non-toxic *Safe for fish & plants *16 oz treats 16,000 gallons Application RateAdd PondTint™ until desired color is achieved, reapply as needed. Persistent Problem Application RateDo a 20‰ water change and re-apply. If problems continue ask a CrystalClear® professional about additional treatments such as an EcoPack™. For Best ResultsApply to an area of the pond with the most water flow for proper dispersion of the product. Product NoticesDo not use where chlorine is present.