[HIGH FILTRATION PERFORMANCE ] - for Essick Air Humidifier filters 1043 does a very good job of filtering out the hardness min-erals in the water . and prevents a white powder from entering the room air and depositing on everything in sight. [FITS MODOLS] - 1043 super wick humidifier filter by - Specially for Essick Air 821000 EP9 EP9R 826000 826800 821000 etc Series Humidifiers.(Dimentions in 11.8inch x 11.1inch x 3.9inch) [PROFESSIONAL DESIGN & ADVANCED MATERIALS] - Our AIRCARE1043 super wick replacement filter with the hot glue strips and dense construction ,Prevent 'slumping' or 'sagging' over time or when wet.High-quality reinforced mesh paper+Cotton Fibers Materials,has small resistance, large dust holding capacity, moisture resistance etc advantage,Far superior competitor paper filter. [REUSABLE&EASY INSTALLATION] - It is fairly easy to install Our 1043 super wick . Simply run the humidifier out of water, Remove the top, remove the frame and the old wick, replace with new, put the frame on the wick.To maximize performance,Recommended only fill humidifier tank with distilled water , wick replacement is every 2-3 months, or at least once per season.