Product review (3 stars): tap water-60ppm and Best filtered water 46ppm
I would say this filter is just OK. I have a TDS meter and have repeatedly measured the water from this filter and my regular tap water. The reading I took today was: tap water-60ppm and Best filtered water 46ppm. These numbers will vary somewhat on different readings. When I first got the filter the readings were much closer and so I contacted the seller to get an answer on what the ppm should be post filter. They gave me an answer like "50-200ppm!" I didn't like that answer. I would expect something like "the ppm should be X less than the pre filter water reading." I will buy a different filter next time to compare it to this one.