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Re: Aquatic Plants Digest V3 #335
Nick Miller wrote:
> On another theme, I read of the use of vermiculite as a medium for
> aquatic plants, and tried the recommended method of waterlogging it - repeated squeezing and kneading. This seemed to be getting me
> nowhere, so I used lake sediment (there is a lake at the bottom of > my garden) instead. 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.
A nother method of "sinking" vermiculite is to place it, in water, into
a vacuum flask and apply low vacuum (a water-pump vacuum is OK).
(It did not occur to me to microwave it!)