The "charcoal" in question is the exterior of a coconut that has been well carbonized and shredded off the coconut. You can find the filler at garden stores for plant pots except those have not been carbonized
It can go bad in lots of ways. It can also usually be repaired, although with certain types of failures it's a crap shoot. The TRSM has the test procedure for the valving. If it's saturated PM me and I'll tell you how best to perform desorption.
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