I have started using 7% copper on a regular basis to control algae. The label says to use four ounces every two weeks for a 20,000 gallon pool and I use a bit more than four ounces every two weeks because my pool has a bit more water than that.

This seems to work well.

I recently heard that using copper regularly this way actually isn't a good thing.

Is this correct?

If so, how "good" a thing is copper to a pool? Is it not really good and to be avoided?

Thank you!