Product review (2 stars): Doesn't work well.
Distill Water 0ppm
Poland Spring bottle water 70ppm
Brita filtered water 100ppm
Older GE filtered water 100ppm
Tap water 130ppm
Newer GE filter water 130ppm (this product)

Old filter works better than the new one!  After changing over 4 large bucket of water, the water test still show it is at 130ppm.  My old one is still better than it?!

I spent $60 dollars on a brand new water tester, and verify that it's working properly.  This filter isn't working as other reviewers have stated.  I didn't believe them and went ahead and bought it.  I have confirmed other reviewer comments stating that the filter isn't working.