Review on CLEVAST Air Purifiers for Home, H13 True HEPA Air Filter with High-Performance Japanese Motor, Advanced 3-Stage Filtration System Odor Eliminator Capturing 99.97% Dust, Smoke, Odors, Pollen, Pet Dander, and more. AP200 (White) by Bill Ramani

My bedroom window faces a busy street, I hardly open the window. too much dust and ash. This air purifier works, I've only used it for about 8 days. ie I need this air purifier. And it's quiet, one-button controls for on/off and speed. The manufacturer of basic and all air purifiers recommends replacing the filter every 6 months to a year. So when I decided to buy this one I also checked the price of this 3 stage filter, it's acceptable selling around $25 on Amazon. It is very easy to clean, then turn it on, use blush to remove dust and ash. I think I clean the filter often, about 4 times a month, the filter can last longer.