Changes

Bottle dregs can also be used a primary fermenter. It is generally advised that mixing different bottle dregs together will provide a greater diversity and thus better results, but using a single bottle may prove to be an educational experience as well. Step the starter up to a 2 liter volume, incubate for another 7 days as above, then pitch into a ~20 liter batch. Alternatively, Jeffrey Crane describes a method of using 1 gallon of wort, which can easily be produced on a normal brew day from a larger batch, to create sour beer from bottle dregs. Essentially this process involves transferring 1 gallon of wort any time during the boil when there are less than 7-10 IBU's. Another simple option is to make 1 gallon of wort from malt extract (DME or LME). That 1 gallon of wort is then used to pitch the sour beer dregs starter into.<ref>[http://www.homebrewtalk.com/f127/easy-way-make-sour-beers-1-gal-wort-dregs-189748/ Jeffrey Crane] describes how to make 1 gallon sour beers from bottle dregs.</ref> The brewer has the option of allowing the 1 gallon of sour beer to age on it's own, or it can be used as a starter itself for a larger batch. Pitch a smaller amount of the dregs starter for 1 gallon batches (~200 mL).