Product review (4 stars): Wish it lasted longer
Bought this as a replacement filter for our daughter's humidifier. We have slightly hard water and it takes no time for these filters to get hard deposits on them. For $10, I feel like they should last longer than a month. Especially when we run our humidifiers all throughout the fall and winter. Hard to know how well they work. We see the filter get full of mineral deposits, so we assume it's filtering all that gunk out! I wish there was a reusable filter instead of having to constantly buy and trash these.