This filter does not need to be replaced every 120 days. You can get by, by vacuuming it and reuse it a few times. Compared to the price of other filters, this filter is fairly inexpensive. Currently, Amazon has the `Buy 4, Get 1 Free' deal on this. With that noted, I have tried Daniel Sessoms' suggestion (found in TrueAir 04712 filter review) on how to make the "Hamilton Beach TrueAir 04381 Allergen Reducer" purifier more HEPA-like. What I did was add a carbon filter to the TrueAir 04712 Filter by purchasing the "Honeywell 38002 Enviracare Universal Replacement Pre-Filter" (an inexpensive carbon filter). From just one Honeywell 38002 carbon filter, I was able to cut up 12 pieces for the TrueAir 04712 filter (The cut up pieces of carbon filter factor to be only $0.65 a piece based on price I purchased at). Next, I just simply tape one piece of the cut up Honeywell 38002 carbon filter to the front side of the TrueAir 04712 filter with regular masking tape (taped up edges to filter). The carbon filter will now act as an extra layer of filter, to prevent dust & also clean up some odor.Every 120 days (or whenever carbon filter turns `gray' due to dust accumulation), I would just remove & throw away the carbon filter, but keep the actual TrueAir 04712 filter (to reuse again). I vacuum the dust off the TrueAir 04712 filter, and tape a new piece of carbon filter to the same side of TrueAir 04712 filter as before. This is to prevent dust on the filter, in case my vacuum didn't pick them all up, from getting suck back into my room again. And when putting back the filter into the purifier, I would make sure to leave the carbon filter facing outward. After doing this carbon filter add-on to the filter, the Hamilton Beach TrueAir 04381 purifier does seem to work better. At least now, not only does it remove dust & pollen, it can also remove odors.
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