Just in case anyone else is comparing ozonators, I've done a lot of googling, but have found very little in reviews or comparisons of various ones. The only thing I can really find out is that CD is better than UV and that it is preferred to have a 24/7hr circulation pump when using an ozonator. I did read one item (and only 1 item) that said DEL has a big marketing share and hence, is popular, but that they don't actually produce anything better if as good as the other manufacturers such as JED, Prozone, or the others. I'm leaning towards the JED 103 because it has higher ozone output.