Question about Xiaomi Smart Air Purifier Elite

Hello
We bought the air filter almost exactly a year ago and the appliance has been running 24/7 on automatic since that day. Today the appliance shows a residual value of 25% of the filter. I vacuum the filter about once a month as it naturally collects dust.
The appliance is great and I think the price of the filter is ok for the fact that it "lasts" a whole year.
I have an air filter from Fellowers in the company and the filter costs over CHF 150.
Greetings

I have also asked myself the question about a different filter and have not found a solution. Perhaps another user knows what to do 😬
What I do know is that the filter still filters particles despite having 0% service life. Use can be extended by cleaning the filter.