Product review (5 stars): It filters water, who knew!
Amazon asked me to write a review.

I took out the deceased filter, removed the new one from the box and stuck it in to the socket in the upper right corner of my refrigerator.

Then I ran about 6 pitchers of water to remove debris from the new filter. Done.

When the warning light comes on to replace, it means you have another 4 months of good use before needing to replace.
A big money saver over time.