53 minutes ago, Auspicious said:
That makes no sense at all.
http://www.lifeionizers.com/blog/reverse-osmosis-water-alkaline/
I fully understand what RO water is and how it's made (I'm an engineer)... It made no sense to me either, but above is one explanation I found and the only rational explanation I could get. Doesn't' mean I believe it - I do have a TDS meter and RO water is WAY lower TDS then Tap water.
I now have 2 tanks for this Steam Oven, now that I know Thermador's fear of RO has to do with the tanks and not the plumbing - If they make the thing work again, and the old tank continues to work - I could just put RO water in it for the next n years and see if it ever gets gummed up. But I'm waiting until it's fixed and we fully understand why it broke.
But even the above explanation I don't fully buy - the biggest city here puts it's water through what is basically RO for the entire city. (http://www.minneapolismn.gov/publicworks/water/water_waterfacts) So would that really be a ph of 5.5? I'm skeptical.
Just tested TDS at our kitchen sink and one bathroom sink:
Unsoftened cold tap water: 300 ppm
Hot softened water: 435 ppm
Cold softened water: 280 ppm
RO Water: 16 ppm
