[smokinreefer]

Ok, so I have a pressure tank, but haven't used it before.

So I just tee the line inbetween the Ro and Di, bypassing the Di going to the pressure tank, then from there to the to the fridge.

But what about the Di output? Do I just put a shut off valve on there? And close it when I don't need water for the aquarium?

Sorry, I'm having a hard time visualizing this. Because there is always water running through the Ro, would I not have waste water continually being produced?