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Re: sinking vermiculite

> Date: Fri, 19 Jun 1998 09:56:41 +1100
> From: "Nick Miller" <millern at wave_co.nz>
> However, I subsequently tried placing a bowl full 
> of very wet vermiculite in the microwave oven.  After a few minutes 
> heating it came to the boil, the vermiculite expanded somewhat then 
> started falling to the bottom of the water column.  Some still 
> floated, and a second microwave treatment fixed that. 

I sometimes use vermiculite to start seedlings, and pour boiling water
onto it to pasteurise it and the container in one go.  This makes it sink
without crumbling too.  I pour off the excess water after it cools.