Product review (2 stars): Water filter with short life cycle
We are a family of four living in Houston, TX. We have now 18 months  experience with these filters. We use about 2 gallons a day from the refridgerator on average. The filter has been changed each time the water flow is low. That means that it is possible to use the filter for a longer time, but where you'll have to wait for considerable time due to low flow rate.

Below is a description of the cycles with change dates:
January 23, 2012
December 2,2012
October 12, 2012
August 12, 2012
April 26, 2012
January 30, 2012
October 23, 2011
August 13, 2011

If you include the vacation time where the water filter has not been in use, the average living time is about 60 days. Let us say that we are adding one gallon of water use to be on the safe side, ie. 3 gallons a day .The the filter will last about 200 gallons.

It can be something with the water in Houston that contains a high degree of impurities.

However, the filter is giving good quality on the water which is the main issue. However, it is at a higher price than what you is lead to believe when reading the product description.