Product review (3 stars): Replacement Filter - seems to be ok, who knows :)
Cannot really tell if does anything at all but its been a year and thought I might as well replace it. Price was fair and it came right away. If you have a unit that requires one of these filters you really need to replace it 1-2 times a year. If you have very hard water then try filling the unit up with filters or distilled water and clean the unit weekly and this may extend the life of the filter.