Product review (2 stars): Unacceptably short filter life
I know hard water cuts the lifespan of a filter, but these are struggling to make it 2 weeks.  When we first bought our humidifier, one filter would last about a month.  Something has changed.  Even adding the bacteriostatic water treatment/conditioner makes no difference.  Makes no sense to spend $20/month on filters - time for a new humidifier.