Using the pwt meter, which I'm told will measure the conductiviy of the
water by sensing particles in the water (correct me if I'm off on this,
please), I find that my city tap  water measures 180.4, or roughly 120
parts per million.
   When run through the counter top filter, it reads 172.2 or roughly
118 ppm.
  My CS measures 31.4 or roughly 18 ppm. 
  I tend to think that the metal in the tap water would be the larger
problem.  


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