Product review (5 stars): Water is cleaner again
Best Price I have found.

They fit right in. Water tasted better right away. I found that they lasted about 4 months with 4 adults. They say 6 when you go to a store to get them, but the pressure from the dispenser was diminished after about 4 so keep an eye on that.
Sears wanted t$85 bucks for 2.