Makes a huge difference in the water taste ( for the better). Previously I had a hard time drinking plain water, now it tastes better that I want to drink it. I also feel safer knowing all the bad particles water can potentially contain. I would also like to praise the customer service department. I had a issue with the machine and emailed customer service. They were very patient with me, responded fast- like same day fast, showed step by step ways to try to fix the issue, and were nothing but very professional and helped us with the issue (much faster than I anticipated). I would leave 10 stars if I could.