Description
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