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When it comes time to eliminate unsightly algae from your water, go for the professionals' choice. Enviro-Blue is a colorant for that natural, "ocean blue" look. For use in reservoirs, lakes, ponds, streams, water hazards, aquariums, fountains, industrial ponds, fresh water and salt water bays. Contains UV blockers that screen out excess sunlight. Long-lasting and nontoxic to fish, animals or plant life (when used as directed). 1 gallon treats 1 million gallons of water.