Quote Originally Posted by ernie1959 View Post
I have to admit that I was shocked to see the anti-ion sentiment here, as it is what our local dealer recommended when we built the pool.
They work out well for pool owners who

1. Don't let anyone with blond hair swim; and
2. Don't mind a few bluish green stains; and
3. Don't let people with infectious diseases swim.

Ionizers ARE good at preventing algae, which is by far the number one VISIBLE problem that pool owners have (and recognize). But, ionizers turn hair and pools green, and pools blue-green or even black. Worse, they don't kill bacteria quickly, or viruses at all. So, ionized pools are normally unsanitary, if a variety of people swim in them.