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

This product seems expensive at first, but it is worth the price in my opinion. It is concentrated and treats a great deal of water for its size. The real advantage is that it doesn't require and special application. No spaying with droplets of a particular size and no need to be in or on the water. You apply it right out of the container. I do walk the edge of the pond to spread it out a little, but the directions say you don’t even need to do that. It is so soluble it spreads throughout the pond on its own. And it works when applied in the correct quantity and on the right schedule per the application instructions. No more algae.

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.

I purchased this product about 2 months ago to treat a small, roughly 200 square foot area of Alligator weed. I followed the instructions applying it twice about two-three weeks apart. I used half the bottle the for the first application and the remaining for the second. The weeds initially turned brown, but after only about three-four weeks from the second application, the weeds are already starting to come back. Definitely not worth the $100+ for the small bottle.

This stuff works. Finally something that cleaned our pond up. I am very happy with this product. It has taken me years to find something that works like this and doesn't harm the fish.

This is 3 steps, 16oz, then 21 days 8oz, then 21 days the last 8oz. I am at the first application not seeing much change yet. The color has faded a little bit. Have to wait and see how the next 2 applications do

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.

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.

This does work but read that they say be patient. We treated on April 12 and 2 weeks later 2nd dose. The pond is now clear. So very close to 2 months of waiting. In Indiana March or April want to get pond clean for graduation party’s etc. This does not work fast enough. If you got time and can stand watching your mossy pond for 2 months, this is for you.