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noone88
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What do you mean inneficient? Do you mean using 3 times as much water just to get RO purified?
Correct
I am being told that Mini-Split A/C (What we need for sealed rooms + co2) Units releases RO water that can be used, is this true?
Yes, you can do that. You have to dial in the room first because depending on your setup, you may have very low humidity (which means it's pulling a lot of water from the air) and you may overflood your RO res. You'll need to make an overflow drain, which is as easy as drilling an E&F fitting and running tubing down a drain.
It also depends on how your minisplit is installed. Unless you're specific, most installers will have the water drain outside into the dirt.