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Ozone <ref>[http://mcclainozone.com/brewery-ozone-sanitation/ Ozone sanitation for barrels]</ref> [need to expand]
* [https://www.youtube.com/watch?v=0ucU7wQ3Ocs Barrel Builders video on barrel storage.]
* [https://www.facebook.com/groups/MilkTheFunk/permalink/1580847248610150/?comment_id=1580881845273357&reply_comment_id=1785009744860565&comment_tracking=%7B%22tn%22%3A%22R8%22%7D Colton Schwartz overview of building an ozone machine.]
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'''Note: Do not burn sulfur in used spirit barrels, as there is a risk of explosion.''' Once a spirit barrel has had a beer aged in it, the ethanol levels within the barrel won't be high enough to cause an explosion. The general rule of thumb is if the spirit can be smelled inside the barrel, don't light a sulfur disc in it.
====Storing full====
Sulfur Storage Solution Method:
<span style="text-decoration: line-through;">A storage solution of 1 g citric acid and 2 g potassium metabisulfite per L (or 1 lb potassium metabisulfite and 0.5 lb citric acid per 225 L barrel<ref>[http://www.thebrewingnetwork.com/the-sour-hour-episode-5/ The Sour Hour with Tim Clifford of Sante Adairius]</ref> (~40 min in)) is often used.</span>
This method is not recommended by some brewers due to the residual sulfur that can be difficult to rinse from the barrel, and the over-extraction of the barrel's flavor compounds into the storage soltuion.
Ozone Method: <ref>[http://mcclainozone.com/brewery-ozone-sanitation/ Ozone sanitation for barrels]</ref> [need to expand]
* [https://www.youtube.com/watch?v=0ucU7wQ3Ocs Barrel Builders video on barrel storage.]
* [https://www.facebook.com/groups/MilkTheFunk/permalink/1580847248610150/?comment_id=1580881845273357&reply_comment_id=1785009744860565&comment_tracking=%7B%22tn%22%3A%22R8%22%7D Colton Schwartz overview of building an ozone machine.]
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