Product review (4 stars): Defective
This is the new model of water filter replacing the previous PUR brand water filter for my Whirlpool refrigerator. The product looks good, packaging is great, and the unit itself is identical to the previous PUR brand. However, after I removed the old filter I installed this new one and water would not flow anymore. I thought I just installed it wrong so I took it out and double checked. The housing of the unit is such that it's IMPOSSIBLE to install it incorrectly. I installed it again making sure it clicked into place and water still did not flow. I put the old filter back in and water flowed without a problem on the first try. I should also mention that when I remove the new filter there's always a rush of air and a small amount of water that comes out, as if it was pressurized when I tried to turn the water on. It's like water goes in the filter and builds up pressure, but nothing comes back out.

After doing this same process multiple times with no solution I went online and looked up any information I could.

Check to make sure the pump is working: check, it's working fine
Check to make sure the reservoir isn't frozen: Check, it's cold but water flows freely
Check to make sure all electrical connections are secure: Check, everything is connected
Check motor to make sure it's pumping: Check, the motor hums along as if it's trying to pump water but nothing comes out.

The only conclusion I could come up with is that the filter is defective. First unit, first try, and it's defective. I realize these things happen, no product can be made with 100% perfection so I know there will always be a few here and there that aren't up to manufacturing standards.

I've utilized Amazon's return policy and am now waiting for a replacement. If the replacement works just fine i'll update this review to something better than 1 star.

****UPDATE****

Having received my replacement filter I installed it and everything worked perfectly fine. I'm updating the "stars" to 4-stars (would have been 5 if original wasn't defective) but i'm leaving my original review from the first filter so others can read that as well.

I'm happy with the product, works like it should, but couldn't give 5 stars due to original defective product.