Tsunami DQ Aquatic Herbicide - Gallon - 37.3 Percent Diquat Dibromide - Concentrated Aquatic Weed Killer for Lakes and Ponds - Duckweed, Watermeal, Curly Leaf, Pondweed & Many More

I've used this product (diquot) for several years to kill an intense Salvinia (koi candy) infestation in my boat slips, near the Gulf of Mexico. Although connected to the Gulf, my bayou is freshwater most of the year, so the Salvinia has been thriving (southern Mississippi). If I avoid spraying this invasive weed 24-hours before and after a rain, it kills it deader than a door nail. Be careful though and don't spray near any plants you want to keep. Even if a plant gets a small, albeit, unintentional, amount of overspray, it can damage, or kill it. The only downside the price. I paid $130/gallon for the last bottle I bought (09-22). That was a $30 increase in price the purchase before that!!

We have a 3 acre pond and usually have problems with duck weed every year. We have thrown everything in the pond to try and solve it. I read about the Tsunami DQ and decided we'd give it a try. I let the pond go too long before treating it and it was covered and thick with duck weed. It was to the point that I couldn't get the boat into the water treat it. I poured the gallon into a pump sprayer and began walking around the edge of the pond spraying out as far as I could on a Sunday evening around 7pm. I had come to terms with the fact, since I had left the pond get covered in the way it had, I would certainly need another gallon to kill it all.The next morning around 6am, you could tell exactly where I had sprayed, the duckweed had turned brown. Day 2, 6am.... approx half the duckweed on the water was gone. Day 3, 6am.... only a 1/4 of the water was covered with duckweed and it was all brown. Day 4... it was totally gone. We have never used anything quite like this. It is well worth the money. Super easy to use and works fast.

I have used this product for several years and it works great on the pond and other surfaces that has too much water. This is the cheapest I have found anywhere.

The stuff really does the job , easy to use , onlyIssue I had was the product had leaked out of it’s container and the plastic bag and the cardboard box too , the instructions and labeling were all ruined by the chemical so I just kind of did a generic mix not knowing the rate rate of mixture. I used a half a cup per gallon. It worked wonders on our weeds on top and under water too .I will buy more , hope they package a bit better in the future.

This stuff is awesome. I use around pond. It kills all vegetation it’s sprayed on.

Product has killed the unwanted weeds out of the pond it will take several applications but be patient it does what it claims

Unknown if can batch mix usage more for commercial large sprayernot for home owners

We have had an issue with duckweed for years, we have tried MANY products, aerators, and a fountain to try and tame the algae/weeds. Nothing worked until we sprayed this product on our pond. It’s amazing-after a week, it’s SO clear. We never write reviews, but this one is totally worth sharing.