BIAB brew in a bag fabric for a brew bag grain crush hop spider how to brew Insulation lost temperature brew in a bag making a brew bag making beer mash no sparge sparge sparging stuck sparge The Brew Bag voile water to grain ratio wort filter
We've seen a good many videos showing how to use a fabric filter to brew in a bag, but there aren't any that detail why this works so well. Here you'll find a bit of science along with some practical information to make great beer in about 3.5 hours using minimal equipment.
About every fourth person I speak with asks why the The Brew Bag is better than a paint straining bag, or why not just get the two pack nylon bag from their local home brew store, or why not just use a muslin bag, "that's what the steeping brew kits come with". So here's the straight up on bag material and why Voile is the best. Paint strainer bags are made of nylon and have a thread count of 45. Thread count is measured in a square inch both vertically and horizontally. Paint strainer bags have 9 threads vertical and...
The utilization is influenced by the vigor of the boil, the total gravity of the boil, the time of the boil and several other minor factors. The vigor of the boil can be considered a constant for each individual brewer, but between brewers there probably is some variation. The gravity of the boil is significant because the higher the malt sugar content of a wort, the less room there is for isomerized alpha acids. The strongest bittering factors are the total amount of alpha acids you added to the wort, and the amount of time in the boil for isomerization. Understandably then, most equations for IBUs work with these three variables (gravity, amount, and time) against a nominal utilization. As mentioned earlier, the utilization for alpha acids in homebrewing is generally accepted as topping out at about 30%.