Lookin' at the jug of Cedarcide it says it contains......
Cedar Oil,..... 20%
Hydrated Silica..... 80%
I have no idea what "hydrated silica" is, but I guess it's non-toxic.
When I first saw that I thought, "wet sand"
So I had to look it up.
Some pretty interesting stuff, IMHO
Hydrated silica is a form of silicon dioxide, which has a variable amount of water in the formula. When dissolved in water it is usually known as silicic acid. It is found in nature, as opal (which has been mined as a gemstone for centuries), and in the cell walls of diatoms. It is also manufactured for use in toothpaste. Once dehydrated the gel is used as a desiccant known as silica gel. It is also used in various paints and varnishes and in the production of beer. When used in both Opals, and Beer, how could a fella go wrong.
Heck, I could even brush my tooth with that stuff.
Uncle Russ...