Product review (5 stars): Shop Carefully!
You really have to shop around for these things. So many different choices with different specifications. I settled on these and have had no problems. I filter city water not for safety but for taste as city water is much more tightly regulated and safer than bottled water not to mention WAY cheaper! So, I use a filter for taste. I can't stand the chlorine taste. This completely eliminates that issue. If it helps with other things too, that's gravy.