In gravel culture type of situation, coke as the supporting medium has advantage in its porosity, holding more solution than gravel or quartz or granite, but no better than haydite. A65-244
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Coke
Coke
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COKE: As Potting Material
It is 88% carbon, inert, with a sponge-like formation; sterile; proven valuable for potting; not available commercially. A61-644+