Product review (4 stars): LIFE LENGTH
I WISHED THE PRODUCT HAD LONGER RUNNING LIFE.... MY WATER IS QUITE GOOD ...NOT HARD AND FILTERED BY THE CITY FOR PROPER PH
I ONLY RUN MY HUMIDIFIER AT NIGHT... ABOUT 10 HOURS A NIGHT WHILE MY OXYGEN MACHINE IS ON....BUT A SINGLE FILTER ONLY LASTS 1 MONTH.