activated carbon

[Piers]

A'm I correct that you can reactivate carbon by boiling it.?
I was told that long ago but I've not herd about it since.
If this is true how long does it need to be boiled.
Piers

[corr]

That's what they say, but it's not proven. I think boiling can remove a lot of the nasties but whether or not the carbon is "reactivated", I'm not so sure.