Product review (5 stars): They work perfectly fine and I haven't had any issues
2nd time ordering these. They work perfectly fine and I haven't had any issues. As always when you install a new one you need to drain or release out about 2 gallons or so of water to clear the charcoal or whatever medium they are using inside. If you don't your water is going to be dark gray and nasty until you get to about 2 gallons used. That might account for why some people are having taste issues, just my guess.