I originally just bought a pack of these air filters for my Dyson TP02 air purifier just to see if it works well. Having previously bought Dyson replacement filters I decided it was worth saving money. My expectations were exceeded. They work just as well and last just as long as the famous Dyson brand filters at a fraction of the price. I have 1 Dyson in my bedroom set to auto/continuous so it almost never turns off and filters non-stop. I have since bought TWICE 2 packs to save even more money. I would rate 1 Dyson filter, 2 filters last about a year depending on air quality (California fire season may take some life from them and working from home has increased their usage). If my Dyson is accidentally turned off (by husband or kids) my allergies and asthma escalate dramatically within hours and the first thing I always check on the Dyson is to make sure it's on. Did I mention we also have 3 cats? Well, add that to the equation! Needless to say, when the Dyson is running, the filters definitely work well judging by my body's response. I can't say if Dyson filters are any better than these substitutes but my allergies and asthma are not caused or made worse by using these substitutes compared to using a well known brand so from my personal experience I would say that they work just as well for a cent price. Because let's be honest. Dysons don't come cheap, and keeping them running adds to the expense. In my humble opinion this option is great value for money and I will continue to buy these non-Dyson replacement parts until the last breath of my Dyson.
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