Product review (1 stars): Half of my cartridges leaked charcoal or water
Bought a pack of two filters in March 2016 and another pack of two filters in March 2017. The first two filters worked great.

The third filter worked great, but on removal after 6 months, its valve didn't close and it spilled water everywhere. The fourth filter immediately leaked charcoal into my purified water/ice supply, and when I removed the filter its valve didn't close and it spilled water everywhere too. Had to throw it out and purge the purified water awhile to get the charcoal out.