I use it. It's actually microscopic fossilized single cell plants. It rips up all bugs, so it's around all the corners of my room as well as on the soil, this page has a nice little artical on it Diatomaceous Earth

It also adds silica, which helps strengthen the stems. :hippy:


I don't think it'd be a be all end all for mites since they will crawl from leaf to leaf and travel between plants rather than over the soil.