Product review (1 stars): Says To Replace Every 5-10 Fillings?!
I'm not sure about the product others received, but according to the information on the box, these cartridges have to be replaced every 5-10 fillings for a 1-gallon tank. WTH? That is once a week! I've never seen a demineralization cartridge that isn't good for approximately 30 uses. For only a few dollars more, you can get the Homedics 4-pack for are good for 30-40 uses.