Product review (4 stars): A Great Filter
We have been using our humidifier for years; we humidify the house and dehumidify the basement. This is the replacement filter that works in our humidifier. Over the years we have also learned that this filter must be changed regularly as the wicking action of the filter causes the filter to fill with sediment and it no longer works; approximately bi-monthly. Not worthwhile to try to clean the filter. The filter is very expensive.