Is zero tds possible with RO only?

[lastlight]

I'll bet if I had the probe installed properly and not just placed in a cup of water it'd be lower.

[Delphinus]

Really, 125 in Riverbend eh? I would not have thought it but then you're off the Bearspaw reservoir and not Glenmore (figured the separation line was further south than that, but maybe not.) Water from the Bow seems to be low 100's, water from the Elbow is high 100's to mid 200's (seems to fluctuate).