If you have a self-cleaning oven, you can try putting the stone in there during a cleaning cycle. Gets hot enough that any organic material clogging the pores should turn to ash, which would blow out easily with the aeration pump.
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Anvil Horn Brewing
Fermenter:
Oatmeal Stout
Edwort's Apfelwein
American Pale
On Tap:
Honey Dunkelweizen
Wee Heavy Scotch
Edwort's Apfelwein
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