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Hydrothol 191 6020396 Herbicide 20lb.

4.0 4.0 out of 5 stars 347 ratings

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Brand United Phosphorus Inc
Item Weight 20 Pounds
Item Form Granules
Active Ingredients Herbicide
Coverage 1000 square feet

About this item

  • Is a concentrated aquatic herbicide/algaecide effective against a wide variety of submersed aquatic weeds and algae.
  • Please refer to product label for dosage rates and use instructions.
  • 20 lb

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$117.00 ($0.37/Ounce)
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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Package Dimensions ‏ : ‎ 19 x 13 x 7 inches; 20 Pounds
  • Date First Available ‏ : ‎ December 12, 2014
  • Manufacturer ‏ : ‎ United Phosphorus, Inc.
  • ASIN ‏ : ‎ B00QXNR7AE
  • Customer Reviews:
    4.0 4.0 out of 5 stars 347 ratings

Product Description

This concentrated aquatic herbicide-algaecide is effective against a wide variety of submersed aquatic weeds and algae. Application rates range from 3 up to 270 lbs per acre foot of water. Normal granular application rates for spot treatment of submersed weeds is 12 lbs per 1,000 sq ft with 4 ft avg depth. Hydrothol treated water may be used for swimming, fishing, livestock watering and irrigating turf, ornamental plants, and crops with few exceptions (please refer to the label).

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Customer reviews

4 out of 5 stars
4 out of 5
347 global ratings

Customers say

Customers are not happy with the value of the weed moss control agent. They mention that it's very expensive and like flushing money down the toilet. Customers also differ on quality and performance.

AI-generated from the text of customer reviews

4 customers mention4 positive0 negative

Customers find the weed moss control agent simple to use, with easy-to-read directions. They also say the product is in pellet form and easy to broadcast by hand or with a hand broadcaster. Customers also mention that the ordering process was quick and easy.

"...It is in pellet form and easy to broadcast by hand or with a hand broadcaster. So I distributed the pellets by hand as it was along my sea wall...." Read more

"Simple to use" Read more

"Worked great! All the weeds are gone where we used this. Easy to use." Read more

"Easy to use! However it has not killed a single thing in the pond!" Read more

33 customers mention12 positive21 negative

Customers are mixed about the performance of the weed moss control agent. Some mention that it works great, is easy to use, and works well for most lakeweeds. However, others say that it didn't work as advertised, had very little results, and was not effective on all types of weeds, including Chara. The weed seemed to flourish after two applications.

"...It doesn't do anything. Save your money." Read more

"This product is fabulous. The seaweed that was at my shoreline is almost gone after one week of application...." Read more

"...product for the weeds in the lake behind my house and the results have been disappointing." Read more

"Had thick, at edge, stringy weed growth from sub surface. Took a 2/3 weeks to see results. It did work! Weeds cleared.But two things 1...." Read more

9 customers mention5 positive4 negative

Customers are mixed about the quality of the weed moss control agent. Some mention that it slowly does the job, while others say that it didn't kill their pond weeds.

"slowly does the job, kills my pond weed." Read more

"...I spread it in the water as instructed, but it didn't kill any weeds. Now I'm using another product which works better...." Read more

"...Killed the grass and also the algae." Read more

"Kills aquatic plants" Read more

6 customers mention0 positive6 negative

Customers are dissatisfied with the value of the weed moss control agent. They mention it's very expensive and like flushing money down the toilet.

"very expensive product but works as claimed" Read more

"...Ordering was quick and easy. It was pricey but if it worked then it's worth it. It was delivered earlier than anticipated and was packaged well...." Read more

"...I found this frustrating and expensive." Read more

"...Pricey and literally did nothing at all. Skip it." Read more

Well 8 days after treatment and weeds still there
1 Star
Well 8 days after treatment and weeds still there
So ordered this to help me clear out my lake sea wall of several different lake weeds both underwater and sticking out of the water. Ordering was quick and easy. It was pricey but if it worked then it's worth it. It was delivered earlier than anticipated and was packaged well. Directions were easy to read and I also read several reviews of what helped other buyers. Basically, I was looking at a 7 to 10 day window to see difference. It is in pellet form and easy to broadcast by hand or with a hand broadcaster. So I distributed the pellets by hand as it was along my sea wall. I video taped it to try to see difference. Its 8 days later and my lake weeds are still very nice and green with no changes. Because we had a cool front move through the area on the 4th and 5th day with rain, I figure I will give it a few more days to see a difference but so far, I have wasted 130.00. My neighbors are watching the progress with me daily because they have the same issue that I have. We will be trying something diffent because so far, this product is a bust! It doesn't do anything. Save your money.
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Top reviews from the United States

Reviewed in the United States on September 17, 2020
2 people found this helpful
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Reviewed in the United States on August 2, 2021
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Reviewed in the United States on July 12, 2023
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Reviewed in the United States on October 31, 2021
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1.0 out of 5 stars Well 8 days after treatment and weeds still there
Reviewed in the United States on October 31, 2021
So ordered this to help me clear out my lake sea wall of several different lake weeds both underwater and sticking out of the water. Ordering was quick and easy. It was pricey but if it worked then it's worth it. It was delivered earlier than anticipated and was packaged well. Directions were easy to read and I also read several reviews of what helped other buyers. Basically, I was looking at a 7 to 10 day window to see difference. It is in pellet form and easy to broadcast by hand or with a hand broadcaster. So I distributed the pellets by hand as it was along my sea wall. I video taped it to try to see difference. Its 8 days later and my lake weeds are still very nice and green with no changes. Because we had a cool front move through the area on the 4th and 5th day with rain, I figure I will give it a few more days to see a difference but so far, I have wasted 130.00. My neighbors are watching the progress with me daily because they have the same issue that I have. We will be trying something diffent because so far, this product is a bust! It doesn't do anything. Save your money.
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6 people found this helpful
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Reviewed in the United States on June 7, 2017
7 people found this helpful
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Reviewed in the United States on April 30, 2023
2 people found this helpful
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Reviewed in the United States on January 14, 2021
4 people found this helpful
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Reviewed in the United States on July 16, 2022
One person found this helpful
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