Product review (5 stars): Super fast replacement
Super fast replacement.  I didn't turn the water off because I am lazy.  I prayed, popped the old cartridge out, and put this one in.  I thought I messed something up because the water sputtered at first until I ran a couple of gallons thru.  I used a pitcher to run the water until it was clear.  Not only was the replacement super easy, I honestly think that my water tastes even better.  I ordered the three pack, and I will order again when I need them.  They are awesome!