Tank Ro/di & Drinking Water

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oh no, the bottle water at work is less than 10 ppm, good thing I just use it for making coffee.

As for the excess waste water, if the unit is not shutting down after no more demand might be time to either clean or replace automatic shutoff valve. I've got a Aquasafe and was not shutting off a while back. Took the valve out, disassembled and gave a good rinse, fine ever since.