My RO/DI unit is 30' from my tank and I was able to run a water line to it so I'm not sure about what the rest of you are talking about.
I have no desire to run 50' of tubing along my basement ceiling from my RO/DI and drill a hole through my floor just to save me from topping up my ATO once a week with a bucket of water.
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So many ideas, so little money!