Re: Borax- a myth?
I have heard of using Boric Acid as an insecticide. It is often confused with borax (sodium borate), they are related in some way, but are not quite the same thing. On the microscopic level it has sharp edges that basically perforate an insect exoskeleton causing it to dehydrate and die.
It is often used by putting into cracks and crevices. According to Wikipedia, it is generally considered safe, but I wouldn’t use it on a carpet, unless I had one of those fancy vacuum cleaners with a HEPA filter. Same goes for diatomaceous earth, which is mostly silica, which isn’t great for you if dispersed into the air as a fine dust.