Makes perfect sense! Thank you for the follow up.My guess is that the CDC updated their chart and in the original chart that I used the CDC had some reservations about reverse osmosis filters. No idea why. (All RO filters, some RO filters, or something else?) Or maybe the CDC was a little sloppy in compiling their information, and I just deferred to them without questioning. That, or I just totally screwed up.
Good question.