Comparison ChartsA lot of these comparison charts are constructed by individual water ionizer companies. This is why they vary so widely. That company is going to state that their water ionizer is the best out of all of them. Some ionizer companies actually make up fake awards and give it to their own ionizer!
The first thing to look for is to see if you can find the person who published the comparison chart. If they are not trying to hide anything, you should easily be able to find their name, email, etc at the bottom of the page. If you can't find this easily, it may be one of these comparison charts made by the company themselves.
Manufacture and CertificationAnother thing to look for is where the ionizer is manufactured. If the ionizer is not made in Japan or Korea then don't buy it! These two countries are the only ones that recognize water ionizers as medical equipment, so they have the proper manufacture guidelines and certification in place.
Testing and QualityOne really important thing to check out on any comparison chart is if there has been any testing done on the ionizers that they are comparing. I have found that this is a key ingredient to finding out the truth about an ionizer. The proof is in the pudding, and in this case by pudding I mean pH and ORP.
I have found through my own testing that the ORP at the drinking level pH will range greatly between ionizers. The more negative the ORP the better. Negative ORP indicates the amount of antioxidants in the water. This is something to pay attention to, as it will benefit you!