The moisture from the yeast and sugar will escape sometimes into the
stone or wooden diffussor and can clog it.
Usually a vinagar bath will fix this.

Marc
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On Wed, 03 Nov 2004 00:52:20 -0500, The Drunken Lord
wrote:

On Tue, 2 Nov 2004 16:57:56 -0500, "Matt C."
wrote:

How will the CO2 clog up the wooden airstone?

The C02 bubbles clog it up.