Hydrothol GranularHydrothol Granular
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Hydrothol Granular Hydrothol Granular

Hydrothol Granular

Our # 1 Seller for Submersed Weeds! Very effective against a broad spectrum of submersed weeds, also controls Problem Algae at the same time - A winning one - two Punch! Hydrothol 191 has been successfully used for over 25 years. The label says it all - pondweeds, naiads, milfoils, coontail, stargrass, hydrilla, canada waterweed and many algae types including the tough ones. A great choice for lakeshore weed & algae control. Apply with a hand scoop or hand held spreader.

Availability: In stock

Product Name Price Shipping Qty
20 lb bag
+ $18.00 Shipping Each Qty:
40 lb Bag
+ Reduced Shipping 26.00 Each Qty:
3 Pack (120 lbs)
+ Reduced Shipping 23.00 Each Qty:
6 Pack (240 lbs)
+ Reduced Shipping 22.00 Each Qty:

Hydrothol Example:

  • Sample: *Typical Rates: 7.5 to 12.5 Lbs per 1000 sq ft. 4 Ft average depth.

Hydrothol 191 Granular Specs:

  • Water Use Restrictions: None on Swimming, None on Fishing, *None on established turf.
  • Container Size: 20 Lb. resealable bag(s)
  • Formulation: Granular


*Consult Label for Exact Doses, Additional Restrictions & Important Application Directions. Rates vary depending upon depth and plant types. Dose requirements are less for whole waterbody treatments like a pond.


The Hydrothol 191 Product Label is available for download in pdf.

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Pond Weed & Lake Service.
1001 Great Plains Blvd.