Sonar RTU (Ready-to-Use) Aquatic Herbicide - 1 Quart Systemic Herbicide for Duckweed, Hydrilla and Most Difficult Aquatic Weeds, No Equipment Needed, Simply Pour in for Season Long 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.

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 have been a big fan of Sonar RTU to kill duck weed on our pond. We have tried many products and methods to remove the duck weed in the past. This product is the most effective. It is easily to apply to the pond water and lasts about 1 month. It never harms the wild creatures in our pond! Love this product!

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!!!

I cannot say enough positive comments on this product. I had used many different products in our 1/2 acre pond to try to eliminate duckweed that covered the entire surface. Aerators, beneficial bacteria, rakes, and MANY other herbicides. Nothing worked! I finally bought a pump and pumped all the water out and left it to dry out for a month. When it started to fill back up, guess what, the duckweed had stayed alive in the dried mud and started multiplying rapidly! My county extension agent said the ingredient in Sonar is the only thing that works on duckweed. I purchased 2 bottles of the RTU Sonar and squirted it from the bottle around the edges of the entire pond. No mixing or sprayers! The instructions call for a reapplication of 1 bottle in 21 days, then 1 more in another 21 days. Don’t skimp on this part! The first 21 days, I noticed a slow reduction of the duckweed and it turned whiteish. The second 21 days, almost all gone except a couple of small areas. After the third application, there was no sign of ANY duckweed! I now have a beautiful, duckweed free pond after 2 years of trying other things. Well worth the money!

One acre pond, that I can’t keep the fish alive through the winter. Problem seems to be too much vegetation going into winter. Per instructions, two containers at first, and then one per month for the next two months. Almost $500. The vegetation browned fairly quickly. I hope enough vegetation died before the ice came. Fingers crossed.

Following the directions and applied to our 1/2 acre pond early in the spring. It's good for about 8 weeks before you need to test again. This is the third year of using the product. Controls all the nuisance lake weeds.

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.