Healthy Ponds Pond Water Colorant and Spray Pattern Indicator Tablets are formulated for ease of use in small ponds and water features, or can be used in a spray tank to avoid overlap and missed areas when spraying turf, grass or gardens. Pond water colorants are essential once water clarity has been achieved using Healthy Ponds products. Healthy Ponds Colorants will effectively shade the pond and limit sunlight penetration, reducing unwanted weed growth and the development of algae. Safe for fish, plants, pets and humans, Healthy Ponds colorants contain no sulfates or dispersion aids, and are made from the same certified food quality dyes used by name-brand candy manufacturers in their colored hard-shell candy coatings. Simply toss the tablet into the water from the shore. Within 24 hours of applying the Healthy Ponds Pond Water Colorant, the pond will take on a beautiful appearance that will reflect the sky, and help make your Healthy Ponds AquaSpherePRO more effective. Tablets are conveniently dosed for small bodies of water. Simply add the correct number of Healthy Ponds Pond Water Colorant Tablets for your pond size. One tablet treats up to 41,000 gallons. To calculate pond volume: length x width x depth x 7.5 = total gallons.