Product review (1 stars): Very metallic aftertaste
My family and I all agree that there is an unpleasant metallic aftertaste when using these filters.  When I installed the filter I did run at least a gallon of waster through it before drinking.  When that did not improve the taste, we ran more water through it with no improvement.  I had to go back to the more expensive filters which work great and trashed the three remaining unused filters that came with this 4 pack.  I can't recommend this product. I hope this review helps you make your decision.