New and have question on mash tun dead space. I have a bottom drain keg I use for a mash tun. Since this is not technically dead space as I recover all of that volume when I drain, how do I account for this in calculations such as grain ratio and mash and sparge volumes. The volume underneath the false bottom is 1 gallon. So when I mash I usually add 1 gallon to the mash volume and subtract 1 gallon from the sparge . How do I do this with brewers friend?