Originally Posted by BrewHark
peterj : That's what I'm afraid of. With a 12# grain bill, I will use 4 gals of water, in addition to the 2 gals I fill my tun to get to the false bottom. To get 6.5 gals to the kettle with nothing left in the tun and after accounting for absorption, I would only be able to sparge with about 3 gals of water. That doesn't seem like enough. So I have been sparging with 4-5 gals of water and pitching some of the wort. I am going to try the dip tube as the poster above suggested, but that still doesn't help with the dead space issue. I hate to lose the false bottom because it works like a charm (and wasn't cheap!). I'm flummoxed.
Yeah I would think a dip tube should do the trick. That should decrease your deadspace so you won't be leaving as much behind.
Now when you say you're pitching some of the wort, what do you mean? Like you're pitching out wort that you drained out? The wort that you drain out first is the most concentrated, and it becomes less and less concentrated as you continue to sparge. If you're pitching out some of your first runnings so you can fit more second runnings (or sparge runnings I guess? Sorry I batch sparge.), you're choosing less concentrated wort over more concentrated which is also bad for effeciency. You should sparge until you hit your pre-boil volume and then stop, no matter how much sparge water you used. This will leave the least concentrated wort behind in the dead space.