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Hydrothol® 191
Hydrothol® 191
Hydrothol® 191

Hydrothol® 191


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Product Label

Hydrothol 191™ is a broad spectrum algaecide and herbicide useful in areas where copper-based products are not an option. 

  • Consult product label prior to use
  • Effective in murky water
  • Apply early in the spring, prior to fish spawning
  • Application should not exceed 0.45 gallons per acre-foot of water
  • Can be harmful to fish populations if used incorrectly
  • Available in 2.5 gallons
Due to governmental regulations, we do not ship these products to the following states: CA, CT, ME, NY, NJ, OR, and WA. Read and follow all local, state and federal regulations pertaining to the use and application of these products before ordering. We do not recommend the application of any chemical for algae, weed, parasite, or disease treatment during the summer months in ponds without an aerator in operation. The reactions of many chemicals cause rapid decomposition of heavy vegetation growth and/or greatly reduce the oxygen content of the water, causing distress and possible death to the fish.