Product review (2 stars): Cannot prove this filter works.
To be honest, I do not believe these filters are effective for one simple reason: My experience with pitcher water filters has shown that as they accumulate sediments and metals, they increase in weight so that at replacement time, they weigh 50% more than when new. This filter weighed exactly the same after one year of use (10 oz.). So I can only conclude that it did not accumulate sediment and copper, zinc, etc. Therefore, it may be completely useless.