If you prefer the natural look. Clean, clear water in a lake with a natural black bottom looks black from all angles. Black Vail concentrate gives you one of the most natural looks on the market.

They are used in some of the finest lakes and garden ponds. Not recommended for use with fountains.

Contains no herbicides or algaecides, is nontoxic and safe for fish, humans and birds. The quarts per acre are typical for 3 acre-feet or approximately 1,000,000 gallons. Sold in quart bottles.