Product review (5 stars): Great for hard water
This filtrations system has been a lifesaver with my new dishwasher since our municipal water is very hard.  Was shocked to find the filter lasts only one month for me during some times of the year.  I don't think this is a reflection on the product - our water tested off the charts for hard water.  We wash about one load of dishes per day.  Most of the time they last 3 or 4 months.