Doesn't the filter fill up well before 12 months? Looks like it is 3 stages ("primary", "high-efficiency", and "activated carbon"). https://www.mi.com/global/

Doesn't the filter fill up well before 12 months? Looks like it is 3 stages ("primary", "high-efficiency", and "activated carbon"). https://www.mi.com/global/product/xiaomi-smart-air-purifier-4-pro-filter/ https://www.mi.com/global/product/xiaomi-smart-air-purifier-... I keep a low-dust apartment, and my 2 Levoit air purifier HEPA filters get changed every 3 months (sooner, if there was an unusual incident). The white of the HEPA material is sometimes visibly gray after 3 months, even though I vacuum the first stage surface every 1-3 weeks.