Vermiculite en Perlite

[MaggiY]

Thanks for the link Maggi. A blog with 600 items that's interesting!

I have found this on Wikipedia:
Perlite is an excellent filter aid. It is used extensively as an alternative to diatomaceous earth. The popularity of perlite usage in this application is growing considerably worldwide. Perlite filters are fairly commonplace in filtering beer before it is bottled.

So when I am reading the 600 articles I will drink a beer and think about the perlite.

Good idea - but you may need more than one beer!