I originally bought 2 packs. I liked them so much that I ordered these 4 packs. I have severe allergies; So it was a welcome change to switch from the ones that required filters to the ones I previously had. I noticed a huge difference the first time I used them! Plus it saves me a lot of money in the long run. I would highly recommend them to anyone as 4 packs per unit are cheaper! Good product!
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