I have had this unit for over a year.I had the pitcher before that for a year. I get 6 to 8 weeks out of the filters and use them every day. I filter the water for drinking, cooking and even brushing my teeth. Zero water simple works great and with the tester I know when to replace my filter. Simple and works! I have a sonic care with water pick tooth brush and I never have to worry about any buildup. There is none!