Free and Total Chlorine

The key to keeping your pool sanitized—and keeping swimmers safe and healthy—is understanding the difference between total and free chlorine.

What Are Combined, Total, and Free Chlorine?

Wait, where did that third option come from? Combined chlorine? Isn’t that the same as total chlorine?
The short answer is no, but it is easy to confuse them. That is, until you understand what each term means, and how each type of chlorine is created.