Membrane SolutionsMSA3 Original Air Purifier Filter Replacement, Upgraded 3-in-1 True HEPA Filter with OdallerPure Technology, 1 Pack

Holy moly! I ordered this after our daughter was diagnosed with allergies. My husband also has really bad environmental allergies and is allergic to dogs and cats, which we have two and one of. Our home is professionally cleaned twice a month, vacuumed and dusted twice a week. We have this larger size on the main floor in the center of our house and then two of the smaller models in each bedroom. This is after one month. I am shocked and appalled, but also so happy that this is being removed from our air. I know the manufacturer notes say these can be replaced every 6 months but I plan to take it out every month to remove all of the debris and possibly change every 3 months, especially during heavy seasonal allergy season right now in our area.

The air cleaner machine is amazing and wonderful, and to certify that I'm loving it and will keep it, I bought a spare filter. So far, the one supplied with the machine is simply great. I have the machine in a fairly large room, and it absolutely does what I bought it for: it cleans the air. Love! That the filter will last nearly a year for me is THE big plus. I don't run the machine overnight, so a year for a large, really good HEPA filter is a bargain at $40.

It came with a card that said the first filter refill was "on us" Referred me to a website that was a dead end!

This filter is HEPA and multi layered. They seem to last a while in my air purifier but boy these are expensive. $40/filter is really high to me. Hope they last a while. Recommend this item as it is high quality and well made. Will be buying again when needed.

Used the product to replace my original purifier filter. It was filthy and the light to change never came on. I did find, using a small vacuum on the old filter cleaned it rather well and I have saved it for a back up for the next time I need to change the filter. I would suggest one examines the filter in the unit due to the fact when I checked mine I felt as thought I should have seen the light letting me know it was time to change.