I was given one as a gift, began to use it, found one on a clearance, so now I have 2 set up.  My daughter has well water in her rental house, I bought one for her and her roommates, and now one roommate actually DRINKS water.  Great investment, I buy the filters in bulk to cover both houses, don't know what I would do without it, because my 7 year old dog has kidney issues, and CAN ONLY DRINK FILTERED WATER!!  Thank you for making such a great product!!