How long does copper sulfate last in a pond anyway?
If you're trying to clear up a murky mess, you probably want to know how long does copper sulfate last in a pond before you have to drag the sprayer out again. The short answer is that while the active algae-killing power usually only lasts about 24 to 48 hours in the water column, the actual copper stays in your pond ecosystem for a lot longer than that. It's a bit of a double-edged sword—you want it to work fast, but you don't necessarily want it hanging around forever. ...