Comparable to Purifier HEPA & Activated Carbon -PUR131 Replacement FilterFilter replacement kit includes one (1) HEPA Filter and one (1) Charcoal based Activated Carbon Pre-filter for Purifier -PUR131, Part -PUR131-RF.Captures 9997% of airborne allergens and contaminants as small as 03 microns including pet dander, mold spores, pollen, smoke and dust from the .Replacing the Filters To replace your the filters in your -PUR131 purifier follow the steps below:1) With the purifier off, unplug the purifier and remove the back cover2) Remove the old filters and properly dispose of them3) Unwrap the new filters. Place the Activated Carbon filter inside the housing first, making the pull tabs are facing the opening4) Install the True HEPA filter into the housing; make the pull tabs are facing the opening.5) Replace the back cover onto the housing6) Plug in and turn on the purifier. Use a pen or a pencil to press the black reset button inside the vent on the side of the purifier. The ""Change Filter"" should now be off Be to also clean the dust sensor on the side of the purifier using a clean cotton swab When Should I Replace My Filters,The filters can be used for up to 6 months, depending on how often your purifier is used.Premium compatible HEPA filter replacement set for Purifier -PUR131colour:Black + whiteMaterial:Plastic + spongePackage Contents:1 * HEPA Filter1 * Activated Carbon Pre FilterOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.