Product review (3 stars): Overprice and Not That Effective
These are way overprice and the manufacturers make bank on them.  I was held captive by Bosch in buying them as they discontinued the bypass plug to get past using the filter.  When we remodeled our kitchen, it was bye bye Bosh and we purchased a different manufacturer's product that had a bypass plug available.  According to studies as well, these filters just really aren't that necessary.  If you need something as effective, buy a filtered water pitcher.