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I know this is a common topic, but exactly what in growing medium is and isn't acceptable for carnivores? Clearly calcium carbonate and high pH, and nitrates are out, but not sure about other salts. The reason I ask is I am a palaeontologist and regularly sieve sand from Morocco for small fossils and end up with a lot of sand left over once the fossils are removed (I have 15 kilos in my office at the moment). This is calcium carbonate free but contains small amounts of gypsum (Calcium sulphate), iron oxides and a quite a lot of mineral phosphate (mostly fragments of dinosaur bone; not very soluble). Any ideas?

Edited by Chimaera

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I'd also be interested to know! There's so much information to be gathered about this. My best input is it probably would be fine for Pinguiculas...........

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I don't know about Cps, but in Rhododendron it seems that calcium is not a problem, indeed calcium shortage is very damaging. It is raised pH that killed them, and you can add gypsum to give calcium with no problem. I also don't see mineral phosphate as a problem unless anyone knows otherwise; it is not very soluble and is apparently phosphorus is not an element Cps get from their food.

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