Well, given that the recommended daily consumption is one US gallon or approximately 3.785 metric liters 10,000 gallons filter life is just over 27 years of straight usage for a single person. Even if you were filtering water for a family of four you'd get almost 7 years of use out of a single filter. I'd say that's pretty reasonable for that price considering most cheap filters are only good for around 50-100 gallons. The frequency of filter changes in the cheaper models would probably average the same or more overall cost in the long term. Thanks for the heads up, I'll have to check this product out.