Pond Logic® Ultra PondWeed Defense® Aquatic Herbicide

Pond Logic® Ultra PondWeed Defense® Aquatic Herbicide

Broad Spectrum Pondweed Control


Cannot be shipped to: AK, AZ, CA, CT, DC, HI, ME, NJ, NY, PR, RI, VT, WA and Canada

  • 530334 - 1 Quart w/ Treatment Booster™ Plus
  • $49.98
  • Broad Spectrum Pondweed Control
  • Fast Acting Liquid Formula
  • Short Term Control Of Duckweed

Pond Logic® Ultra Pondweed Defense® works on pond weeds including submerged, floating and emergent weeds. This pond herbicide may be used for short term control of Duckweed in slow moving water. Use pond weed control solution with Treatment Booster Plus all season-long on actively growing plants for best results. Early season emergent treatments may require additional applications.

Pond Logic Ultra PondWeed Defense

Tech Specs

Usage Information

Pond Logic Ultra Pondweed Defense 32 Ounce
32 Ounce
Pond Logic Ultra Pondweed Defense 1 Gallon
1 Gallon
Application Liquid Liquid
Temperature Restriction None None
Square Footage Per Container Up to 5,000 Square Feet Up to 20,000 Square Feet
Shelf Life 2 Years 2 Years

Dosage Rates

Treatment Area
Ultra Pondweed Defense®
Treatment Booster Plus
2,500 Square Feet 16 Ounces (1/2 Quart) 1.5 Gallons 4 Ounces
5,000 Square Feet 32 Ounces (1 Quart) 3 Gallons 6.5 Ounces
7,500 Square Feet 48 Ounces (1-1/2 Quarts) 4.5 Gallons 10 Ounces
10,000 Square Feet 64 Ounces (2 Quarts) 6 Gallons 13 Ounces

Please note: Above are recommendations. Always read the product label.

How To Apply

Mix the amount of Ultra Pondweed Defense® and Treatment Booster Plus (if using) with pond water in a tank sprayer according to label instructions. Use a pressurized pond sprayer to spray the Ultra Pondweed Defense® mixture directly onto to the target weeds.

When To Apply

Ultra Pondweed Defense® has no temperature restriction, but it should only be applied when weeds are actively growing. Use with Treatment Booster Plus for best results.


  • Wait 3 days before using treated water for human drinking water.
  • Wait 1 day before using treated water for livestock and domestic animal consumption.
  • Wait 5 days before using treated water for irrigation.

Chemical Application Best Practices

Anytime you use chemicals to treat algae or weeds, please keep in mind the following:

  • Treat your pond in sections. Treat only half the pond's surface at a time. During hot weather or when treating heavy growth, it is important to treat no more than ¼ of your pond at a time and wait the full 14 days before re-applying. This helps lower the risk of fish loss during hot weather or when treating heavy growth.
  • Once the algae or weeds have browned & died, use a rake to remove as much dead material as possible. This prevents an accumulation of dead plant material and muck.
  • Take a proactive approach to pond management. Use PondClear, MuckAway and Pond Dye to keep your pond looking great. For more information, see our article on the Airmax® Ecosystem


Replacement Parts

Here are the replacement parts for Pond Logic® Ultra PondWeed Defense® Aquatic Herbicide.

Weeds Treated

The first step towards effectively treating any pond weed is proper identification. Pond Logic® Ultra PondWeed Defense® Aquatic Herbicide is recommended for use against each of the weeds listed below. Click on your desired weed for more information and alternate control options.

  • American Pondweed
  • Bladderwort
  • Clasping Leaf Pondweed
  • Coontail
  • Curly Leaf Pondweed
  • Duckweed
  • Eurasian Watermilfoil
  • Hydrilla/Elodea
  • Lily Pads
  • Sago Pondweed
  • Southern Naiad
  • Watermeal
  • Water Shield