Just the other day a customer of mine (I'm not in the pool business) and I were talking about his pool and he told me he's used a flowtron ionizer for several years and he loves it. He didn't mention using any chlorine at all but I had to cut the conversation short. I told him I'd be back to learn more about it, just because I like to learn more about pools. I'll certainly pin him down about whether he uses chlorine as a supplement. He said he uses the flowtron 3 days in and 1 day out, though I'm not sure why.
Hal