Backset (Setback)
Backset, also called setback or stillage backset, is the spent, acidic liquid recovered from the bottom of the still and added to a new mash to lower its pH. It is the basis of the sour mash process.
In short: Backset, also called setback or stillage backset, is the spent, acidic liquid recovered from the bottom of the still and added to a new mash to lower its pH. It is the basis of the sour mash process.
Adding backset acidifies the mash to a range yeast favors and bacteria do not, giving batch-to-batch consistency and protecting fermentation. The backset percentage is a recipe variable worth recording per cook, since it influences both fermentation and flavor.
How much backset goes into a mash?
Sour-mash bourbon cooks commonly replace a quarter to a third of the mash water with backset, the acidic stillage from the bottom of the still. The exact ratio is part of the house recipe and affects pH, flavor, and yeast health.
Backset vs setback vs stillage
The terms overlap: stillage is everything left after distillation; backset (or setback) is the thin, screened portion returned to the next mash. The rest becomes spent grain for feed, a byproduct stream worth tracking too.
Tracking this in a spreadsheet? Spirit Sight records it where it happens and builds inventory, compliance, and the books from the same entry. See it on a demo.
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