Hydrothol Granular Aquatic Herbicide & Algaecide 20 lb
Cannot be shipped to AK, CA, CT, DC, DE, HI, MA, ME, NJ, NY, RI, VT, WA

Hydrothol Granular Algaecide and Herbicide

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

Manages planktonic, filamentous, and branched algae ( green water algae, string algae, chara, nitella)

Weeds managed:

American Pondweed
Curly Leaf Pondweed
Sago Pondweed

Should NOT be used in ornamental ponds, or ponds with Koi or Goldfish.

How is Hydrothol applied?

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. 


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


 Click here for more information about aquatic herbicides available for pond weed control