Hmmmm. Interesting information. According to the chart, my Aquify with my Proclears is 12%. So, is this chart saying that for maximum comfort, I should try one of the 1% types? And the plain old saline doesn't disinfect, right? So I would actually need something else if I were to select the non-preservative saline? I think the chart brought up more questions than it answered for me. Since my doctor gave me the Aquify, I just assumed it was the best for comfort. But perhaps the Aquify representative left more samples that the other guys? I do see on one of the charts that more staining correlates strongly with less comfort. And there are over 3,000 people in the study, so that's a pretty large sample size. Again, Hmmmmmm.