hqrp 6-pack humidifier wick filter compatible with procare pccm-832n pccm-840 cool mist humidifier, ac813 pcwf813 pcwf813-24 replacement hqrp replacement for parts # wf813, ac813, pcwf813, pcwf813-24, rwf-813. <br>compatible with procare pccm-832n, pccm-840 cool mist humidifier. <p>hqrp humidifier filter features honeycomb filtration to trap mineral pollutants found in water. <br>for optimum performance, replace filter at the beginning of each season or every 2 months depending on use.