We use this every day for making coffee and cold drinks,
makes tap water taste good,
We never drink tap water,[does not taste good ] to many chemicals that may cause harm ?
gave it 4 stars, for following reason,
only problem I had was the water test meter did not work after a short period of time,
water test meter did not last long, not impressed with water test meter,
" I called to address this problem and was told to BUY another meter," 
no good will here ! 
could not test the water,so
now I change the filter every 3 months,or sooner if water starts to taste funny,