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Quantity
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Sonar 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. Unlike other aquatic herbicides, Sonar has no restrictions...
Reviews
3.5
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I assume that the formula has been changed sometime in the last 2 years, whether intentionally or due to poor quality control. The first 3 years of use it was 100% effective, but the last 2 years it has been almost inconsequential. I now have had to use other (traditional) products after application last year and this year's results are appearing to be just as unsatisfactory. Very expensive product that was actually worth the money but now appears to have been altered to be less effective.
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David · May 28, 2026
Have not used any of the product from the newly purchased bottle of Sonar A.S. but have had great success with the Sonar A.S. product in the past to control pond duckweed growth and expect to see more of the same with the new bottle.
