Hydrothol Granular Aquatic Herbicide AND Algaecide
Hydrothol Granular acts as both an herbicide and algaecide, making it an excellent choice for pond owners. Hydrothol reacts quickly once applied to ponds with actively growing algae and weeds.
Treats up to 10,000 sq ft
Active Ingredient: Mono Salt of Endothall 11.2%
What does Hydrothol granular kill?
Planktonic algae (green water algae)
Filamentous algae (string algae, pond scum)
Branched algae (chara, nitella)
Curly Leaf Pondweed
Should NOT be used in ornamental ponds, or ponds with Koi or Goldfish.
Applying Hydrothol Granular
Apply granular herbicide in areas with active weed/algae growth with a gloved hand or granular hand spreader.
Hydrothol Application Rates
|Treatment Area (with avg depth of 5')||Managing String Algae||Managing Chara & Nitella||Managing Submerged Weeds|
|1,000 sq ft||2 lb||4 lb||4 lb|
|10,000 sq ft||20 lb||40 lb||40 lb|
|40,000 sq ft||80 lb||160 lb||160 lb|
*See product label for additional dosage rates for ponds with flowing water
When is the best time to apply Hydrothol?
It is best to treat with Hydrothol early in the season when weeds/algae begin actively growing.
Aquathol Super K vs Hydrothol Granular
Hydrothol Granular and Aquathol Super K are both granular aquatic herbicides. Aquathol targets pond weeds. Hydrothol targets pond weeds and algae.
Aquathol has no water use restrictions. Hydrothol can be toxic if applied at a stronger rate than recommended on the product label. Only treat 10% of surface area at one time with Hydrothol to limit the risk of toxicity to fish and invertebrates.
Cannot be shipped to AK, CA, CT, DC, DE, HI, MA, ME, NJ, NY, RI, VT, WA