I like this filter, I had to replace it after 8 months!
You notice especially from the Duux Sphere that it will make noise, then it is high time to replace the filter, and that was the case with me after 8 months.
The more often you use the Duux Sphere air purifier, the life of the filter becomes shorter, about 6 months.
You all notice, for example, when breathing in the beginning with a new filter goes very well and after that it becomes less because the filter becomes full of dust, and the device makes noise, then you do indeed have to replace the filter.
I think this filter is of good quality and quite easy to install, eh you only have to put it in once and then it's ready.
The Duux Sphere air purifier together with this filter is in my bedroom and I notice that I can breathe better and no longer have a stuffy nose after morning!
And the price is right! :)