Roger,  there is a definite difference.    I got my food grade from ebay.   
Check it out.
Huggs
zoe W  

Friday, April 27, 2007, 4:33:14 PM, you wrote:
> 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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