How Long does it Take for Hydrothol Granular to Work?

Hydrothol Granular is a contact herbicide and algaecide that is rapid-acting. It can be used to treat a wide range of underwater weeds, while simultaneously controlling problematic algae. Because it acts rapidly, it works effectively in slow moving water in addition to still water. It can be used in lakes and ponds, as well as in irrigation and drainage canals. Hydrothol Granular provides control where you apply it, not away from the target area. For this reason, it is a valuable tool in improving access to water for recreation activities like swimming, fishing, and water skiing. Because it does not bind to sediment or organic matter, Hydrothol Granular is effective in muddy or murky water.
How Long does it Take for Hydrothol Granular to Work?Hydrothol Granular generally takes about 17 to 21 days to see the full results of an effective aquatic weed treatment. Hydrothol Granular is a contact herbicide, meaning that it controls the plant cells in the treatment area of the lake or pond that are in contact with the Hydrothol Granular for 6 to 12 hours on the day it is applied. This contact time with Hydrothol Granular disrupts the aquatic weeds abilities to photosynthesize. From there, the lake or pond weeds will turn from green to brown generally after about 2 weeks and then wilt and die-down from there. This timeframe is faster than other herbicides like ALS inhibitors and Fluoridone.


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How do you Use Hydrothol Granular?

Hydrothol Granular should be spread evenly throughout the treatment area when plants and/or algae are actively growing. The amount applied must be within the allowable application rates specified on the product label. It is recommended to use a broadcasting spreader to most effectively apply the product. Once the targeted weeds or algae are completely dead, they will typically wilt to the bottom and get pulled to deeper water by natural water movements. You can let this natural process clear the treatment area of effectively killed aquatic weeds, or use a rake to remove the dead material in order to prevent an accumulation of muck and dead algae. MuckMaid® can save you this manual labor by digesting and dissolving that muck buildup with easy applications of these beneficial bacteria pellets. Bundle the Hydrothol and MuckMaid® and save big!

If the target treatment area is an entire body of water, such as a pond or small lake that has been infested with hydrilla, curly-leaf pondweed or other invasive aquatic weeds, the water body should be treated in sections to minimize the risk of fish kills. Avoid treating more than half of the water body at one time and wait 10-14 days before another application. Additionally, in hot weather, you should only treat one fourth of the water in one application and wait at least two weeks before using Hydrothol Granular again.

If you are treating small areas of larger water, such as just around your dock area on a larger lake, you will want to select a high application rate of 3 ppm to 5 ppm. If you are treating a large section of a smaller body of water, you can select a lower application rate (1 ppm to 3 ppm). Do not treat more than 10% of any water body at one time with doses in excess of 1 ppm.

Make sure to read the product label for complete application directions, restrictions and safety tips.


What does Hydrothol Granular Kill?

Hydrothol Granular is a broad spectrum herbicide, meaning it kills many types of aquatic weeds. It is also an algaecide and can be used effectively to treat algae. Some common lake and pond weeds and algae controlled by Hydrothol Granular are:

  • American Pondweed
  • Hydrilla
  • Coontail
  • Clasping Leaf Pondweed
  • Curly Leaf Pondweed
  • Large Leaf Pondweed
  • Eurasian Watermilfoil
  • milfoil
  • Naiad
  • Sago Pondweed
  • Filamentous Algae
  • Planktonic Algae

Hydrothol Granular is an extremely effective and versatile tool to remove unwanted weeds and algae from your water. You can control where it is applied and what it targets. It is easy to use and fast acting. Check out Lake Restoration’s Hydrothol® Granular product to enjoy a clearer pond or lake. Bundle the Hydrothol and MuckMaid® and save big!