Originally Posted by Jadog
I bought a 50lb bag of Copper Sulfate crystals/powder and would like to begin treating a 4 acre lake that was freshly dug last summer. I'm starting to see some green stuff around the perimeter and wanted to get ahead of it. The landscaper that I purchased it from suggested that I pour about 10lbs inside of a pillow case and then tie it off with a rope and drag it around the perimeter of the lake which would allow it to diffuse into the water. Alternatively, I've read that it should be mixed into a tank sprayer with hot water and sprayed around the lake. Some say they sprinkle the crystals or powder with a broadcast spreader or by hand sprinkling. Just wondering if there is a "best" method to this before I give it a go this weekend.

The "best" way to apply it is to read and follow the label, dissolving the correct amount in water and spraying it on the area that you want to treat. You have to read the label and use it correctly, it is toxic to fish if used incorrectly.

I found a copy of the label on-line, here it is, follow the directions. Depending on the type of algae that you have, you have to apply it so it has a concentration of between 1/4 and 2 PPB.

https://www.domyown.com/msds/Crystal_Copper.pdf

If it's medium or large granules, then it's made to drag around in a burlap sack. If it's the fine Copper Sulfate, then it's made to be dissolved in water and sprayed. *make sure you triple rinse out your sprayer or the copper will eat the insides out relatively quickly if you put it away without cleaning it.*

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