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BEERSMITH NO SPARGE FULL
Typically the full desired boil volume is used in the mash, giving a water to grain ratio that is 3-5x that used in a traditional mash. With Brew-in-a-bag, no-sparge, and some decoction mashes, a much higher water to grain ratio is used. This results in a fairly thick mixture, and additional water is added after the mash is complete, during the sparge, to reach full volume. Traditionally, mashing is done at a relatively low water to grain ratio of around 1.25 quarts of water per pound of grain (a bit under 3 liters/kg). Why BIAB, No-sparge and Some Decoction Mashes Are a Special Case Often additives such as a buffer or acid is needed to adjust the mash pH. Unless you are brewing a very dark beer style, however, you typically won’t have enough acid in the mash to drive the pH down to the desired 5.2 level. Grains, particularly dark grains, are slightly acidic, and will drive the mash pH lower once you mix the water and grains for the mash. Water, whether from a surface or underground sources is typically alkaline. Unfortunately most mash mixtures will come in at a higher pH unless you adjust them. All grain beers benefits greatly from a low mash pH – promoting better conversion, a cleaner finish and a more balanced overall beer flavor. Ideally you want to keep your mash pH in the 5.2-5.5 range, and for lighter beers driving the mash pH down to the 5.2 level becomes even more important to achieve good beer clarity. The pH of the mash matters for any all grain brewer. The larger water to grain ratios used in these mashes can lead to higher mash pH during conversion, so brewers need to take additional care working with these methods. Controlling your mash pH is a critical concern for all brewers using all-grain, but can be a special concern for those using Brew-in-a-bag (BIAB) or decoction mashes with high water to grain ratios.