There is some really good stuff about Diatomaceous Earth here
https://richsoil.com/diatomaceous-earth.jsp
I've been using DE in the home for bug control. It works a treat on fleas and it's pretty good at moth and carpet beetle prevention. It's brilliant for chickens! They end up eating most of it, but enough stays on that it gets rid of the mites and lice.
I don't like using it in the garden as it kills good bugs as well as unwanted ones.