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A couple questions

Hello everyone,
Still planning out my 120 gallon system, these questions arose in my mind:
1. If you are using a wet-dry filter on a CO2 injected tank, and you left
the wet-dry open to the room air, you would lose most of your CO2.  But then
if you sealed the wet-dry to keep CO2 in the water, wouldn't this defeat the
purpose of using wet-dry?  After a short time, with carbon-dioxide injected
water trickling through the sealed filter, the chamber would fill up with
CO2.  The water would be coming in contact with CO2, not oxygen.
2.  This one is just curiosity....  Wouldn't water coming out of an RO unit
be a pH of 7?  I thought these produced pure water, without anything else in
it.  So why then, is the pH of RO water low? (in the 4-6 range)
Please clear me up on these if I'm wrong.  Thanks for the help.
Brad Larsen