Could I safely use copper sulfate in my swimming pools as an algaecide? I used cupric sulfate as an algaecide in my swimming pool for a while without problem. I was adding a very small quantity of it (one teaspoon when the season start and 1/4 teaspoon whenever I add water.) However, a "swimming pool expert" told me I should not, that it is dangerous, and various others claim (Obviously, he wanted to sell me his own algaecide). I had many problem this year to keep my swimming pool clear of algae, So I'm considering returning back to cupric sulfate. So, I made my own search and this use copper sulfate seam quite controversial: * Some say it is ok * Some say dont use it * Some say maybe * Some are even more confusing Does someone has an objective notice for that?

As with any chemical, it depends on the amount. Overdose and you'll not be very well off. Check the volume of your pool and keep it below 1ppm.

> The EPA limit for copper sulfate in drinking water is 1 ppm. This limit has been set to prevent a disagreeable taste from copper in drinking water, as well as to provide adequate protection from toxicity.