Changes

''Update:'' The lined out instructions above have sometimes been advised by wine makers, and presumably taken from their instructions <ref>[http://www.juicegrape.com/documents/documentview.ashx?id=412fa046-2de0-4051-9d41-a1ee012cea11 M&M Wine Grape Co. Citric Acid & Sulfite Barrel Preparation. Retrieved 03/06/2016.]</ref>. Jay Goodwin from The Rare Barrel, however, reported sulfur off-flavors in beers from using too much potassium metabisulfite in their barrels. The beers needed extended aging for the sulfur to be volatilized off. Eric Salazar from New Belgium Brewing advised that they cut the potassium metabisulfite content down to 1 ounce per 59 gallon barrel (~0.017 ounces per gallon/~0.127 grams per liter), and to check the barrel once a month and change the storage solution once a month if needed <ref>[http://www.thebrewingnetwork.com/the-sour-hour-episode-28/ The Sour Hour Episode 28. Jay Goodwin from The Rare Barrel. 02/17/2016]</ref> (~49 minutes in). The amount of citric acid is the same: 0.5 lb per 59 gallon barrel (1 gram per liter/0.13 ounces per gallon) <ref>Private correspondence with Mike Makris from The Rare Barrel by Dan Pixley when asked to clarify the amounts that Eric from NBB recommended. 03/06/2016]</ref>. Note that the [http://barrelbuilders.com/wp-content/uploads/2015/02/Barrel-Maintenance-Repair-Manual.pdf Barrel Builders, Inc. "Barrel Maintenance and Repair Manual"] recommends slightly more potassium metabisulfite (1.6 ounces or 45 grams per 60 gallons) and slightly less citric acid (6.4 ounces or 180 grams per 60 gallons). Before using a barrel holding this sort of storage solution, the barrel should be intensely sprayed and rinsed thoroughly(not just filled up with hot water and dumped).