Originally Posted by watergod
I've been brewing for about two years with a all grain system. I'm looking into trying something new and making an attempt at Biab. I'm not sure what size pot to use for a 5 gallon batch and also will those 5 gallon paint strainers at Home Depot work for a bag?
BIAB can be done two ways. No sparge or what I call pseudo sparge. The difference is the size pot you need or can get away with.
With no sparge, your pot needs to be big enough for the grain, all of the mash water and the water lost to grain absorption. (pre-boil volume +grain volume + grain absorbtion water). Any of the calculators can simplify the math.
Pseudo sparge BIAB can be done in a smaller pot, but you will need a second pot to heat sparge water. I use a 7.5 gallon turkey fryer for the mash pot, and a 5 gallon (formerly used for extract )pot to heat sparge water. I mash at more traditional AG thicknesses of about 1.25-1.5 qt/lb of grain. then I pull the bag & drain through a colander. after draining, I pour 1/2 the sparge water through the grain bag, and then tea bag the bag into the sparge pot. Fire up the boil kettle while finishing the sparge & re-draining the bag. add remaining sparge water and boil.
5 gallon paint strainer bags work great. You need a bag big enough to hold the grain, not the full vloume of the pot. clip the bag to the pot edges with binder clips.