Hi roger,
Have a chat to your the brew master at your local brewery.  Just don't breathe 
that stuf either.

hth,
Tony


On 28 Apr 2007 at 11:33, Roger Barker wrote about :
Subject : CS>Diatomaceous Earth

> Hi all, I'm trying to source some food grade diatomaceous earth down  
> here in New Zealand and keep coming up with the pool filter heat  
> treated variety. Can anyone tell me if there is a visible difference  
> between the food grade and the heat treated variety as I'm sure there  
> must be some of the right kind available around here somewhere?
> 
> Cheers,  Roger B
> 
> 
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