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

Sensational product. I had submerged vegetation covering 95% of my pond. With such ease of adding to the pond within two weeks, 2/3 of the vegetarian was gone. One week later I had no more vegetation, and the water was so much cleaner.

We've battled Azola in our small pond for years. Twice a year, we'd have to get creative with some good old-fashioned redneck engineering, scraping and scooping out the layers by hand. The Azola always came back. Once it's there, it's almost impossible to get rid of. We tried virtually every herbicide, both legal and not-so-legal, available in California, without success.Finally, we gave this product a shot. We did our usual manual cleanup and then poured in the whole bottle in on April 27th. For weeks, nothing happened, and we were starting to lose hope. But then, out of nowhere in June, everything changed. The attached photo was taken on June 10th, just seven weeks after treatment, and for the first time in probably 10 years, we can see the bottom of the pond clearly. This stuff really worked miracles for us, and we'll definitely keep using it and sticking to the recommended maintenance.

I have a small backyard koi pond of approx. 800 gallons that got duckweed a couple of years ago from some plants I had ordered on eBay. This product is expensive but I hadn’t found a better option, so I bought a bottle and did the math to determine that I needed to add a whopping 3 ml. I double checked my work and got the same answer. So I used a syringe that had come with an inkjet refill kit, shook the bottle, sucked 3 ml out, and squirted it into the pond. It remained kind of congealed so I did mix it into the water.A week later and the duckweed turned light in color and started to die off. I skimmed most of it off and it’s obvious that it is no longer spreading. I’ll reapply in a couple of weeks per the directions but I stand amazed that 3 ml was this effective. It does not appear to be affecting my 3 koi at all.

Not only is this stuff expensive, I do not think it works. After almost 2 weeks of applying as directed, we do not see any visible changes in our pond that is invaded by duckweed. We applied this LAST year with no results. The company stated we needed to apply 4x the amount (4x cost). We waited until this year (2024) and applied a competitive product (AurmaxKnockout) and only used 1/2 the bottle and our pond is clear of Duckweed only after 7 days!!! Sepro tried to give us a "deal" of 30% off a $900+(yes I said nin hundred) product that they claimed would clear our duckweed problem. Instead I bought Knockout and only spent $100 on a bottle I only used half of!!!

Great alge control

I have ordered this product more than one time, as every time I want to eliminate any duck weed in my pond right away before it gets out of hand. My pond was covered with duck weed, and after much online research, I decided to try this. It's easy to put in the pond, no need for a sprayer or dispersing it while in a boat. It works fast, and I'm pleased with the results. Non toxic to plants and animals.

Definitely a very stressful first 14 days. Didn’t notice much difference even with some rain that helped knock down the duckweed.Once I started to see a difference it worked very quickly. 21 days I waited to add the second application by the instructions.I’m currently a week out from third application and the pond has been very clean and duckweed free.Now under the instructions it does state that if your pond has a lot of water change meaning it will have high flow of water through pond from a stream or creek that feeds your pond it will dilute this product too much as it is a slow acting chemical. My situation is pond is currently low as the amount of rain we have received is lower than many years prior.It works very well would highly recommend but be careful of aquatic plants you like it kills everything and will even start to affect cat tails.

Works good on duckweed if use recommended amounts. Doesn't seem to kill floating pond leaf very well.