Product review (1 stars): Make water worse than the tap water
After I install this filter, I used a total dissolved solids (TDS) monitor to test the water quality. Much higher than the tap water!  After flushing a few gallons, the TDS is still higher than the tap water. I even suspect it has been used before. This is my first time of giving 1-star on amazon. I don't know this is a problem related to my seller or the quality of the product.