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Systemic Aquatic Herbicide Sonar® A.S. by SePRo 1 Pint


Sonar® A.S. will remove unwanted weeds from your lake or pond for a year or longer with a single treatment. No other aquatic herbicide on the planet is more effective on duckweed, period. .

Sonar® A.S. is the most effective and cost-efficient treatment you can buy for the selective, long-term control of undesirable weeds. Now homeowners can enjoy the benefits of time-tested application methods and materials developed by SePRO scientists to reclaim lost waters in some of the largest and most environmentally sensitive lakes in the United States. SePRO is the recognized world leader in advancing the science of aquatic plant management. Trust your pond to SePRO and Sonar®.

Sonar® A.S. selectively manages undesirable aquatic vegetation for a year or longer and is recommended for use in water bodies with soft or muck bottoms. Sonar® A.S., or Aqueous Solution, is easy to apply and just one application will provide season-long enjoyment of your pond. Sonar A.S. is available for immediate uptake into the target plants and is the ideal choice in water bodies with minimal water flow and when targeting strands of floating vegetation such as duckweed. Water treated with Sonar® A.S. will not harm any wildlife in or around your pond and can be used immediately for swimming or fishing.

4 in stock (can be backordered)


Use Sonar® A.S. for effective control of stubborn Duckweed and Watermeal!

  • Selective systemic aquatic herbicide
  • Use in fresh water ponds, lakes, reservoirs, potable water sources, drainage canals and irrigation canals
  • Vascular aquatic plants controlled by Sonar A.S. include (for full list, see product label):
    • Bladderwort
    • Coontail
    • Elodea
    • Duckweed
    • Watermeal
    • Hydrilla
    • Spatterdock
    • Illinois pondweed
    • Watermilfoil
    • Alligatorweed
    • Creeping waterprimrose
    • Spikerush
    • American frogbit
    • Bacopa
    • Pickerelweed
  • Immediate uptake into target plants
  • Ideal formulation when targeting strands of emersed vegetaton
  • Designed for whole lake or pond treatment
  • 1 Pint
  • Active Ingredient: floridone 41.7%
  • Application rates vary by waterbody, please see product label for details
  • For best results, apply Sonar® A.S. prior to installation of weed growth or when weeds begin active growth (mature target plants may require application rate at higher end of specified rate range and may take longer to control)
  • Best when spread across the surface area of the waterbody
  • See Product Label and Safety Data Sheet below for usage directions.  Use only as directed.
  • Due to governmental restrictions, we do not ship EPA registered herbicides and algaecides to the following states: AK, CA, CT, DE, HI, NH, NJ, MA, MD, ME, OR, RI, WA, & VT.  *Restricted use pesticide in Michigan and New York. Must provide a copy of your pesticides applicators license prior to purchasing this product in Michigan or New York.

Learn More:

Sonar® A.S. by SePro Product Label

Sonar® A.S. by SePro Safety Data Sheet

Additional information

Weight15 lbs
Dimensions9 × 9 × 9 in


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