This is the second time my Dreame unit has required me to change the filter. Both times, upon doing so with actual DB hardware, the device stopped working and errored out. I had to send it back to DB to get it repaired (which took two months last time). This time, they’re telling me I have to pay for it, even though it’s been less than a year since the last repair, and the problem is identical. Do not buy this machine. If you need a new filter, you may as well throw the whole thing out.