Knockdown Defense

This is really good stuff, but definitely do not make it too strong. It will even kill grass around. The pond if made to strong a bit pricey though

Absolutely blown away with how effective this product is. I used a single application as directed and it removed 100% of the duckweed in about 2 weeks. I planned a second treatment, but patience was all that was needed. Incredible product, wish I found it sooner. Also this pond is used for irrigation of the lawn and beds. I waited 5 days as per instructions before using for irrigation and had not issues with my lawn or plants. After pic shown first.

Received today with no caps.

I use this for algae in our 1 acre pond and have always been pleased with the results. As it stated it will also kill weeds, so you want to be careful what it sprays on if you have plants you don't want to be harmed. For me I have found this is nice to help take some unwanted weeds out while taking care of the algae. Over the years I have tried a lot of different products, but using pond die to handle the most part and this when/if an algae starts, it keeps things in check.

We have a small pond (maybe 1/4 acre) and it is shallow. So we get a lot of algae due to warm temps and sun hitting the bottom. I apply this via a hand pump tank sprayer and a kayak. I’d suggest rigging it so the nozzle is just below the surface and then just paddle around for coverage. Note that before initial treatment I did skim as much surface algae as possible to help reduce how much dead algae sinks to the bottom. Be advised that it will affect other plants in the pond if you have them. We had an over grown section of cat o nine tails at one end and their growth is noticeably stunted.

This works really well with Midwest ponds

I bought this to deal with a duckweed problem in my pond. The product claims it works on a range of invasive weeds, including duckweed, so I decided to give it a try. I followed the recommended dosage for my pond size and condition, but saw no results. I had actually ordered one extra bottle, so I increased the treatment, still no change. Thinking I might have gotten a bad batch, I ordered a second round and treated the pond again. Same outcome, no noticeable effect. I even tried a third time, and still nothing. At that point I had gone through 7 bottles at about $100 each, so this ended up being an expensive lesson. After that, I switched to a different product (after doing some more research), and one treatment took care of the problem. Pros: None Cons: Did not work on duckweed No noticeable results even after multiple treatments Becomes very expensive with repeated use Bottom line: There are products out there that do work for duckweed, but this wasn’t one of them for me. I would not recommend it.

Completely eliminated the duck weed, even though I only treated 1/2 of the pond. Second dose to clean up the floating algae. No noticeable affect on the fish. Very easy to apply and is a good value when compared to other treatments.