granular herbicides UPL Hydrothol 191 Granular Pond Algaecide and Herbicide
SKU: 19501458462
granular herbicides

granular herbicides UPL Hydrothol 191 Granular Pond Algaecide and Herbicide

Sale price$24.22 Regular price$26.91
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  • USA
  • CAN

Ships within 48 hours · Estimated delivery Jun 30 - Jul 5

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Description

granular herbicides UPL Hydrothol 191 Granular Pond Algaecide and HerbicideHydrothol 191 Granular Algaecide Herbicide is a selective, rapid acting, contact herbicide and algaecide. Controls submersed weeds and algae in lakes, ponds, irrigation canals, and drainage ditches. Works rapidly enough to be effective in both still and slow moving water. EPA approved Works quickly Not swimming or fishing restrictions Works on both Algae and Pondweeds! Available in a 20 pound bag only. *Cannot be shipped to: AK, CA, CT, DC, DE, HI,

Hydrothol 191 Granular Algaecide/Herbicide is a selective, rapid-acting, contact herbicide and algaecide. Controls submersed weeds and algae in lakes, ponds, irrigation canals, and drainage ditches. Works rapidly enough to be effective in both still and slow-moving water. 

  • EPA approved
  • Works quickly
  • Not swimming or fishing restrictions
  • Works on both Algae and Pondweeds!

Available in a 20-pound bag only. 

*Cannot be shipped to: AK, CA, CT, DC, DE, HI, MA, ME, NJ, NY, PR, RI, VT, WA 

Application Rate

 

For Algae Control  60 lbs treat up to 1 surface area 4 feet-deep
For Aquatic Weed control  120 lbs treat up to 1 surface area 4 feet-deep 

 

Direction for use:

To apply Hydrothol 191 Granular, simply broadcast the granules uniformly over the water surface above the target plant, by hand or with the use of a mechanical spreader.

              
Pro Tip:

Heavy algae or pondweed infestations should be treated in sections 5 to 7 days apart to avoid oxygen depletion from decomposing dead vegetation.

Water treated with Hydrothol 191 Granular should not be used for irrigation or human and animal consumption for 7 to 25 days depending on the application rate.

Please see label for complete product information. 

Can not be shipped to PR, HI, AK, or Canada

 Product SDS Sheet & Label

                                                                 

Hydrothol 191 Granular SDS Sheet                    Hydrothol 191 Granular Label

               

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 19501458462

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Reviewed in the United States on May 12, 2026
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N K
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★★★★★ 5
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Reviewed in the United States on December 21, 2025
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Barb Verham
Carnegie, US
★★★★★ 4
Source Natural is a good brand but I find 5 mg too strong and need to split them.
As a person with sleep problems due to illness I can say that this melatonin works to get me to sleep sooner. I don't sleep most of the night without it and this brand works better than others I've tried. I can't use 5 mg though and find 2.5mg better. I'm cutting them in half and don't plan to order 5 mg. again.
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Reviewed in the United States on May 30, 2017
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Sunny
Houston, US
★★★★★ 5
Works wonders for me
I love this product since it works immediately (due to the sublingual delivery system). I also appreciate that I can halve or even quarter the tablets easily.
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Reviewed in the United States on May 16, 2024
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Mel S.
Alexandria, US
★★★★★ 5
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Reviewed in the United States on March 1, 2020

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