Aqua shade pond dye is a blend of blue and yellow dyes which shades specific portions of the sunlight spectrum (red-orange and blue-violet) required by underwater aquatic plant and algae growth. This shading inhibits photosynthesis in young, bottom growth and may prevent development altogether if the color is maintained throughout the early season. Aqua shade is primarily effective in water deeper than two feet, floating plants such as lilies are unaffected by this product if they have already reached the surface. Water treated with aqua shade will retain a light aqua-blue tint following application. One gallon treats up to 1 acre, 4-6 feet deep. Just pour along the shoreline as needed.