Product review (1 stars): they aren't a good deal at all
We bought a set of two and are having problems with both of them. The first one only lasted about a month so I replaced it with the 2nd one and it immediately started having the same problem of causing the water system to make a clanking noise.  Our Maytag filters last for a year without a problem, so even though these are cheaper up front, they aren't a good deal at all.