Product review (5 stars): Works pretty well
So far seems to be working alright. We already have a reverse osmosis system for our well water and doesn't really change the ppm reading (water goes in at ~86ppm, and comes out about the same). I just needed a cheap clean filter since ours was really old (never used the water/ice maker in first 3 years of owning fridge).

Update: It's been a few weeks and the ppm readings have actually gone down. Our readings are now around 60 ppm. So it's doing it's job.