You can over tint your pond, but Crystal Blue pond colorant is a food grade dye and non-toxic to fish and animal life. If you put more then the recommended dose in your pond, the color will be a darker color, but dissipate over time.

 

** Please note, the gallon size is meant for larger ponds a 10th of an acre or higher. Colorant is available for small, backyard decorative ponds in smaller units and shows dosage by gallons.