Bill Davidson wrote:
>
> Halon is a brand name for the chemical Carbon Tetrachloride...
> The county water quality people nearly shut down my water well last year
> because we got just one reading of .6 (point six) parts per Billion
>
> The county gave me some printed information on Carbon Tetrachloride:

Bill,
I think your county is a bit confused. Halon 1211 is
bromochlorodifluoromethane, formula CF2CIBR. Halon 1301 (also known as
Freon 1301) is bromotrifluoromethane, formula CBrF3. 1000 ppm is the
OSHA PEL. Carbon tetraflouride is CF4, I believe, and is a nasty
character.
Larry