RiMAX Black Pond Dye Concentrate 32oz / 1 Quart (Treats 1 Acre 4-8ft Deep or 1-2 Million Gallons) (AKA: Super's Choice) Treats Koi ponds, water gardens, and lakes Filters sunlight to reduce unwanted plant growth and creates a pleasing appearance Will not stain surfaces, birds, fish, plants, or pets when used a recommended application rate. Compatible with most aquatic herbicides & algaecides One quart treats an entire surface acre of water or 1-2 million gallons of water.