Thanks guys. I do have a TDS and generally wait for the readings to rise before replacing the filters. It is normally about 17-25 ppm. (It used to hover at 0 or 1 when I first got it but not anymore even with all of the filters changed)
I assume that when the DI cartridge has changed color though that it is out or at least close.
Do you guys use cold, hot or mixed water?
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