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Best duckweed killers - April 2026

Last Updated - April 4, 2026

1
Best Choice

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Airmax

Airmax Wipeout Pond Weed Defense, Herbicide & Aquatic Weed Control, Controls Duckweed & Other Unwanted Submerged & Floating Vegetation, Easy-to-Use & Long Lasting, All-Season Treatment - 8 Ounce

Airmax

$249.99

More Details
Main highlights
- Treats Entire Body of Water in a Single Application: WipeOut pond weed killer is designed to treat your entire pond or lake with a single application right from the shoreline. For best results apply early in spring with pond dye, even before plants are present.
- Long-Term Pond Weed Control: Provides an easy-to-use, all-season treatment for the entire water body. The systemic ﬂuridone herbicide controls submerged and ﬂoating pond weeds slowly by reducing their chlorophyll, starving them of nutrients without a rapid oxygen depletion or a ﬁsh kill.
- Enjoy Your Pond After Application: WipeOut aquatic weed killer has no temperature, swimming, boating, fishing, or livestock restrictions and can be applied early in the season, providing long-term control of nuisance pond weeds.
- Easy Application: Simply mix treatment with pond water and pour in several spots around the pond's edge. Treat once and then enjoy your pond all season, without the hassle of continual treatments. A great solution for busy pond owners as well as for HOAs, commercial facilities, and golf courses with ponds. No sprayer or granular spreader required.
- Combination Treatment Effective on Floating & Submerged Aquatic Weeds: Controls duck weed, water lilies, coontail, fanwort, watermilfoil, American pondweed, bladderwort, curly leaf pondweed, hydrilla, elodea, lily pads, sago pondweed, spatterdock, southern naiad, and other common species.
$249.99
2
Best Value

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

SePRO

Sonar RTU (Ready-to-Use) Aquatic Herbicide 1 Quart, Systemic Weed Control for Duckweed and More - No Mixing or Equipment Needed - EPA Approved, Season-Long Treatment, Safe for Fish & Wildlife

SePRO

$131.98

$141.44
(7% Off)

More Details
Main highlights
- The most simple DIY systemic herbicide you can buy, just pour in the right dose directly into the pond
- No Mixing, No Spray Equipment, or Boat needed
- Easy to dose just use 4 quarts per 1/2 acre (4-6ft depth avg)
- EPA Approved and Non-toxic for fish, pets, and wildlife, so it’s good for use in residential ponds, farms, and lakes
- Due to compliance with state regulations, shipments to AK, CT, HI, ME, NJ, NY, WA, and Canada are not permitted. Orders from these states will be voided
$131.98
$141.44 (7% Off)
3

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Crystal Blue

Tsunami DQ Aquatic Herbicide - Gallon - 37.3 Percent Diquat Dibromide - Concentrated Aquatic Weed Killer for Lakes and Ponds - Duckweed, Watermeal, Curly Leaf, Pondweed & Many More

Crystal Blue

$119.99

More Details
Main highlights
- This product is not for sale in the following states: AZ, CA, CT, ME, MN, NH, NJ, NY, OR, VT, WA
- Safe for Water Use: When used as directed, Diquat is safe for fish, wildlife, and other aquatic organisms, making it an ideal solution for maintaining water balance without harming the ecosystem.
- Fast-Acting Formula: This powerful herbicide delivers rapid results, quickly killing submerged, floating, and emerged aquatic weeds in ponds, lakes, and other water bodies.
- Effective Aquatic Weed Control: Tsunami DQ is a Diquat based Aquatic Herbicide that is specifically formulated to target and control a wide range of unwanted aquatic plants and algae, ensuring a cleaner, healthier water environment.
- Easy-to-Apply: Comes in a ready-to-mix concentrate that is simple to apply with sprayers, allowing for targeted treatment of problem areas.
$119.99
4

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Crystal Blue

Tsunami DQ Aquatic Herbicide - Gallon - 37.3 Percent Diquat Dibromide - Concentrated Aquatic Weed Killer for Lakes and Ponds - Duckweed, Watermeal, Curly Leaf, Pondweed & Many More

Crystal Blue

$113.99

$119.99
(5% Off)

More Details
Main highlights
- This product is not for sale in the following states: AZ, CA, CT, ME, MN, NH, NJ, NY, OR, VT, WA
- Safe for Water Use: When used as directed, Diquat is safe for fish, wildlife, and other aquatic organisms, making it an ideal solution for maintaining water balance without harming the ecosystem.
- Fast-Acting Formula: This powerful herbicide delivers rapid results, quickly killing submerged, floating, and emerged aquatic weeds in ponds, lakes, and other water bodies.
- Effective Aquatic Weed Control: Tsunami DQ is a Diquat based Aquatic Herbicide that is specifically formulated to target and control a wide range of unwanted aquatic plants and algae, ensuring a cleaner, healthier water environment.
- Easy-to-Apply: Comes in a ready-to-mix concentrate that is simple to apply with sprayers, allowing for targeted treatment of problem areas.
$113.99
$119.99 (5% Off)
5

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Airmax

Airmax Wipeout Pond Weed Defense, Herbicide & Aquatic Weed Control, Controls Duckweed & Other Unwanted Submerged & Floating Vegetation, Easy-to-Use & Long Lasting, All-Season Treatment - 4 Ounce

Airmax

$129.99

More Details
Main highlights
- Treats Entire Body of Water in a Single Application: WipeOut pond weed killer is designed to treat your entire pond or lake with a single application right from the shoreline. For best results apply early in spring with pond dye, even before plants are present.
- Long-Term Pond Weed Control: Provides an easy-to-use, all-season treatment for the entire water body. The systemic ﬂuridone herbicide controls submerged and ﬂoating pond weeds slowly by reducing their chlorophyll, starving them of nutrients without a rapid oxygen depletion or a ﬁsh kill.
- Enjoy Your Pond After Application: WipeOut aquatic weed killer has no temperature, swimming, boating, fishing, or livestock restrictions and can be applied early in the season, providing long-term control of nuisance pond weeds.
- Easy Application: Simply mix treatment with pond water and pour in several spots around the pond's edge. Treat once and then enjoy your pond all season, without the hassle of continual treatments. A great solution for busy pond owners as well as for HOAs, commercial facilities, and golf courses with ponds. No sprayer or granular spreader required.
- Combination Treatment Effective on Floating & Submerged Aquatic Weeds: Controls duck weed, water lilies, coontail, fanwort, watermilfoil, American pondweed, bladderwort, curly leaf pondweed, hydrilla, elodea, lily pads, sago pondweed, spatterdock, southern naiad, and other common species.
$129.99

Best duckweed killers - April 2026

Airmax Wipeout Pond Weed Defense, Herbicide & Aquatic Weed Control, Controls Duckweed & Other Unwanted Submerged & Floating Vegetation, Easy-to-Use & Long Lasting, All-Season Treatment - 8 Ounce

Sonar RTU (Ready-to-Use) Aquatic Herbicide 1 Quart, Systemic Weed Control for Duckweed and More - No Mixing or Equipment Needed - EPA Approved, Season-Long Treatment, Safe for Fish & Wildlife

Tsunami DQ Aquatic Herbicide - Gallon - 37.3 Percent Diquat Dibromide - Concentrated Aquatic Weed Killer for Lakes and Ponds - Duckweed, Watermeal, Curly Leaf, Pondweed & Many More

Tsunami DQ Aquatic Herbicide - Gallon - 37.3 Percent Diquat Dibromide - Concentrated Aquatic Weed Killer for Lakes and Ponds - Duckweed, Watermeal, Curly Leaf, Pondweed & Many More

Airmax Wipeout Pond Weed Defense, Herbicide & Aquatic Weed Control, Controls Duckweed & Other Unwanted Submerged & Floating Vegetation, Easy-to-Use & Long Lasting, All-Season Treatment - 4 Ounce

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Sonar RTU (Ready-to-Use) Aquatic Herbicide 1 Quart, Systemic Weed Control for Duckweed and More - No Mixing or Equipment Needed - EPA Approved, Season-Long Treatment, Safe for Fish & Wildlife

Diquat Aquatic Herbicide (1 Gallon)

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Weedtrine D Aquatic Herbicide 1 Gallon Spray for Fast, Broad-Spectrum Control of Duckweed, Floating, Submersed & Emergent Weeds, Professional-Grade, Easy to Use, Diquat Active

Weedtrine D Aquatic Herbicide 1 Gallon Spray for Fast, Broad-Spectrum Control of Duckweed, Floating, Submersed & Emergent Weeds, Professional-Grade, Easy to Use, Diquat Active

Tsunami DQ Aquatic Herbicide- Quart - 37.3 Percent Diquat Dibromide – Concentrated Aquatic Weed Killer for Lakes and Ponds - Duckweed, Watermeal, Curly Leaf, Pondweed & Many More

Tsunami DQ Aquatic Herbicide- Quart - 37.3 Percent Diquat Dibromide – Concentrated Aquatic Weed Killer for Lakes and Ponds - Duckweed, Watermeal, Curly Leaf, Pondweed & Many More

Airmax Shoreline Defense Emergent Weed Control Concentrated Treatment, Aquatic Herbicide (Glyphosate) for Phragmites, Pond Grass & Cattails, 1 Quart

Airmax Shoreline Defense Emergent Weed Control Concentrated Treatment, Aquatic Herbicide (Glyphosate) for Phragmites, Pond Grass & Cattails, 1 Quart

Atticus Semera 51.0% WDG Aquatic Herbicide (1 lb) – Controls Duckweed & Unwanted Submerged & Floating Vegetation - Flumioxazin 51%

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