Product review (1 stars): They aren't shipping what you ordered
I ordered an MWF filter. What they shipped me was an MWFINT filter. They claimed this was the new name, and that it will work exactly the same.

It does connect to my refrigerator, and it does pass water through it. There may be some filtering going on, but you'd never know by tasting the water. I never should've accepted their substitution. It isn't the same, and it passes water that tastes awful.

DON'T accept the substitution. You'll regret it.