This stuff, I think it's the lime, they don't explicitely say on the site, color is gray like cement or gravel: https://cumbasilmite.de/products/cumbasil-mite-25-kg ! !
They hadn't touched it, then I just mixed a little straw in and after a couple minutes they practically dove in and now won't leave.
I'll try and rig a Rickstick, thanks!
I'll bet that it's potash, diatomaceous earth, and maybe dolomite lime. Should do the trick.
Just saw that they have an English language version of their site, in case you're interested. https://cumbasilmite.de/en/
Translation is okay(ish).
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