Product review (1 stars): Terrible
I saw some positive reviews and took the leap and ordered a three pack; big mistake.  After installing and the usual flushing of a good number of gallons through we are still getting visible black flakes (1/4 to 3/8 inch in length) floating about in the water.  Until I get a replacement real filter that filters out impurities instead of inserting them in, I'm using the tap for water.  I can't help but think if I can see this many large visible items floating about, what smaller, unseen things are there.

This kind of product has to be one you can trust, and you can't trust these.