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> Hydrothol® Granular

Hydrothol® Granular

Hydrothol 191
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Granular aquatic herbicide and algaecide for lakes only.
Just $99.99 for 20 pounds!
Price: $99.99 (USD)
LR3717

Hydrothol® Granular is a granular aquatic herbicide and algaecide for lakes and controls nearly all types of lake weeds, including milfoil and hydrilla.

  • EPA Approved
  • No swimming or fishing restrictions
  • Works best on firm, sandy lake bottoms


We recommend using Hydrothol® Granular and MuckMaid®. Hydrothol® Granular will control submerged weeds and MuckMaid® will consume nutrients and silt that help aquatic weeds grow.

Hydrothol® Granular should be spread evenly throughout treatment area when plants are present. Most effective when applied on a calm day. When applying Hydrothol® Granular aquatic herbicide, we recommend using a broadcasting spreader.

Hydrothol® provides control where you need it, in the application area, not away from the target area. For this reason, Hydrothol® is a valuable tool in improving access to the water for recreational activities such as swimming, fishing, and water skiing. Hydrothol® is effective in muddy or murky water because it does not bind to the suspended sediment or organic matter. Hydrothol® is also an effective algaecide.

Manufactured by United Phosphorus, Inc.

Aquatic Herbicides Water Use Restrictions (according to label):

  • Swimming : 0 days
  • Drinking Water: 0 days
  • Domestic Uses: 0 days
  • Fish Consumption: 0 days
  • Irrigation, Food/Crop: 0 days
  • Irrigation, Turf/Ornamental: 0 days
  • Livestock Watering: 0 days

Types of Weeds Controlled:
Milfoil
Hydrilla
Submerged Weeds

Read all product labels for complete instructions before applying products.

Shipping Information:

FREE Shipping on Orders $50+
Orders that are $49.99 or less will be charged $8.95.

Orders are usually shipped within one day by a ground carrier.

US Shipping Only. International Shipping available for the TORMADA®, Goose D-Fence®, LAKEMAID® and select products.

Certain regulations apply for shipping to AK, AZ, CA, CT, HI, MA, ME, NJ, NY, VT and WA. Please contact us if you live in one of these states: 1-877-428-8898

Combine Your Purchase With
Broadcasting Spreader
Broadcasting Spreader
$23.00 (USD)
MuckMaid®
MuckMaid®
$27.00 (USD)
Mizzen
Mizzen®
$14.75 (USD)
Customer Reviews
(4.53)
# of Ratings: 19
Click Here to rate this product
1. on 9/19/2019, said:
This stuff is AWESOME. I NEVER leave reviews on something unless it is a complete bust or amazing and this is definitely amazing. We have a 15 acre lake on our property in Central Texas and the hydrilla was awful. We used this stuff and it is the first time I could swim off the boat ramp, out to the middle without touch the hydrilla!! Will be buying more next year!
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2. on 7/29/2019, said:
Easy to apply, I've been using this product for about 10 years. Apply once in the late spring, and its good for all year.
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3. on 7/24/2019, said:
Excellent product for controlling weeds along the shoreline.
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4. on 7/18/2019, said:
Product worked great. Much better than I expected. We will be ordering every year. Thank you
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5. on 7/17/2019, said:
Works within two weeks in my pond.
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6. on 7/17/2019, said:
I like the price compared to other brands and it works just as good! Seeing less weeds this year, second year of using it and i will continue to purchase it if price doesn’t go up. I’d like to see if there is something that treats the “crab grass” type of weed, it gets brown but we go in and have to rake it out and the roots are deep! Leaves a big whole when it comes out finally.
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7. on 7/17/2019, said:
First of all, Shipping is outstanding! I ordered on a Sunday and received product on Tuesday. Only 2 days, unheard of. I like the product, works pretty fast, will have to treat one more time pretty soon.
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8. on 7/17/2019, said:
We have used HD granular for 4 years now. While it worked on the weeds the first year or so, now it controls none of them. Probably have eliminated the susceptible weeds and now have the more resistant ones left.
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9. on 7/17/2019, said:
Hard to say much more than it simply works if you have the weeds that are in its list to control best.
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10. on 7/15/2019, said:
This is my second year using HG and it seems to have a cumulative effect since there we very few weeds this year compared to last. For reference, we're located on Little Pine Lake on the Whitefish Chain in Crosslake, MN
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