At least some of them don't really work at all. https://www.youtube.com/watch?v=...

		bipson on Jan 21, 2020 \| parent \| context \| favorite \| on: A small DIY air purifier At least some of them don't really work at all. https://www.youtube.com/watch?v=VM9CJZpqfpA With something as simple and effective as HEPA-filters, it seems unreasonable to try other technologies.