Pond Boss Forums AQUATIC VEGETATION Controlling unwanted plants question about duckweed

Fluridone is applied so it reaches a certain PPB in the water. To do that properly you need to take accurate depth measurements of the water in the pond so you know how much to use.

You need much less for a 3/4 ac pond that is 3 feet deep vs. one that is 20 feet deep.

It also helps keep the required PPB in the "kill" range if you bump the pond with a 2nd half strength dose 2-3 weeks after initial application. It degrades with sunlight, so it lasts longer in ponds where the water clarity is less. Some ponds that have high visibility in the water are treated with dye to reduce the clarity before treating.

I'd shoot for a 90 PPB dose. Here's a copy of the label. Read it first before ordering. Too little and it'll be a partial or a no kill. You'd have to spend that $ all over again to buy the correct amount to treat the BOW again. http://www.sepro.com/documents/sonaras_label.pdf

SePro isn't the only one that "makes" fluridone, but it was the easiest label to grab.