reverse osmosis
Actually I was curious of the TDS reading of the Safeway RO water as well, but I got my TDS meter after I got my RO/DI unit, so I didn't have any Safeway RO water left around to test.
I would suspect that it would be low, but probably not 0. And like Darren mentioned, you have no idea how old the membranes are on those things. The water could actually have higher TDS readings than our tap water if the RO membrane was completely gone.
And what if the installer used copper anywhere in the lines? I shudder to think! [img]images/smiles/icon_eek.gif[/img]
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