Pond Logic<sup>®</sup> Ultra PondWeed Defense<sup>®</sup> Aquatic Herbicide

Pond Logic® Ultra PondWeed Defense® Aquatic Herbicide

Broad Spectrum Pondweed Control

Review star icon Review star icon Review star icon Review star icon Review star icon
Rated 5.0 out of 5, based on 1 review

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

  • 530334 - 1 Quart w/ Treatment Booster™ PLUS
  • $59.99
  • 530154 - 1 Gallon
  • $149.99
  • Buy 2+ Gallons for $134.99 Each
  • 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. It may be used for short term control of Duckweed in slow moving water. Use 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. Treat only up to half of the pond's surface and wait 10-14 days before a second treatment. In hot weather or when fish are stressed, treat only 1/4 - 1/3 of the pond's surface at a time. For deeper water, place the sprayer's tip beneath the water's surface. Over time, the weeds will begin to brown and die. Once completely dead, use a rake, like the Pond & Beach Rake, to remove dead weeds to prevent an accumulation of dead plant material and muck.

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.


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
Write a review
New product for us
Aug 10, 2015 | By Cathy and Larry King
Review star icon Review star icon Review star icon Review star icon Review star icon
A massive thank you for a great product! Wish we had only known of and used this product sooner. My husband and I have been pouring a lot of hard-earned cash into an ever-growing expense treating our 3 acre lake in hopes of controlling the weeds. Over the years we have literally spend thousands of dollars. In the last two months, two treatments that appeared to work at first - but regrowth was to no avail and returned very quickly again. The treatment failed. The weeds did not die. I was sick to think our hard-earned money was literally being poured down the drain. The treatments we have come to depend on were not working. We were becoming very dissatisfied and told that perhaps EVEN MORE EXPENSIVE products may be necessary. Then we decided to "try" your Ultra PondWeed Defense with Treatment Booster PLUS to treat our lilies. We sprayed only one 32 oz of Ultra PondWeed Defense with 8 oz Treatment Booster PLUS and 4 gallons of water onto the lily weeds growing in our 3 acre lake. By the same afternoon we noticed the lilies were already beginning to darken and die! Within 3-4 days all the lilies have died and disappeared! Amazing! The product really works, now we have a solution to our weeds! Thank you for rebuilding our confidence in the treatments for our lake. The results are amazing! No doubt if we have additional concerns or questions we will be your returning customers! Thank you thank you, we can't say it enough! PS I love the ease of measuring found "pre-marked" on the containers! It definitely takes the guess-work out of measuring!

Customers Also Purchased