![]() Mrlard wrote:very strange i alway work on the rule of thumb 1 kg will absorb 1 litre Have you been mashing short and high, or long and low recently? How well you mix your mash could also be a factor, as could mash time and temp. Base grains will generally hold more water than roasted grains. Wheat, oats and rye will all hold more than barley. ![]() Type of grain also influences absorbtion. More dust=more absorbtion while the more intact a grain, the less it absorbs (this could also be playing a role in your lower gravity, although that could be down to the increased volume). Is the air on the damp side?Ĭrush plays a role as a variable. A very humid environment will lead to more moisture in the grain, meaning it will absorb less (it can only absorb so much). The moisture content of the grain will vary with enviromental conditions. Kai Paulsen's batch sparge simulator allows you to play around with the absortion assumption.s Grain water absorption is affected by several factors, and the maths is based on assumptions about them. Gravity is spot on tonight, because I adjusted my water volumes according to recent results, but I still find it odd that this variable has changed so much. So only 4.5 litres lost to the grain - 0.98 litres lost per kilo. ![]() Tonight I am brewing again and thinking maybe I have been slapdash with the amount of liquor I have been adding recently have taken extra care over the total water: I did a brew on Friday and using 5.292 kg of grain lost under 6 litres in stead of closer to 9. However the last five or six brews I have done I am ending up with lots more wort than expected, often at a lower gravity than planned for. Up to now.įor water lost to grain absorption during the mash Daniels suggests 1.67 litres per kilo of grain as a rule of thumb, and up until recently I have found this to be bang on. Since I started doing all my brewery calculations by hand (rather than software), I have been using formulae from Ray Daniels' Designing Great Beers and have found them to work really well. ![]()
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