The machine at the Walmart is actually an RO/DI unit. I double checked, then looked again. LOL I wanted to make double sure that it was RO/DI. Then I checked the maintenance routine on both machines, that was when I noticed that they do maintenance on it on the 10th of every month. Right now I'm looking for some containers to carry the water, they have 5 gallon containers, but they are $10 a piece. I am just checking to see if I can get them more reasonably priced someplace else (yes I am that anal). I am thinking of getting 2 and just making 3 trips. Luckily the trip to Walmart only takes 5 minutes.