>30% fine Cambark.  What is the US equivalent to <

Joyce,
He is probably referring to Kambark Corp products, either pine or cypress 
ground barks.  On the left coast, I would be using redwood bark should it still 
be available.  You are looking for a substrate that DOES NOT support plant 
growth....slow to decompose.

Cheers from the Albemarle,

Mark Mazer
Hertford, North Caroolina USA
USDA 8a
Alas, not many alpines here on the coastal plain
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