Aquascape 98882 Blue Pond Water Tint for Pond and Water Features, 8-Ounce Safely tints water blue to filter sunlight Non-toxic dye helps keep pond water clean, clear and cool One dosage lasts up to 6 weeks Easy-to-use pump top; 8-ounce bottle treats 5,000 gallons of water; single dose (1 pump) treats 100 gallons