I had someone come to my house to test my water and when I saw the results I was shocked! No wonder why my water had such a terrible taste! The amount of particles in my water was well in excess of 200! After some research and a recommendation from my daughter who also has a Zero filter, I decided to give it a try! Best decision! Water tastes great and nice and cold from my refrigerator! Even my coffee tastes bettering! It is hard to get good tasting cold water but I have it now! Great product!!