Coming from BIAB (well, one use of my mash tun for a mini mash, but my sparge was a disaster and I got an efficiency of 48%!), I can't quite get my head around water volumes and temps for batch sparging. Lets say I'm brewing a beer, aiming for 19L in the FV. I put all the figures into brewers friend, and it says I need to start the boil with 28.5L of wort, and will need 32 litres of water in total. So far so good. I'm going to go with a 3L/Kg Mash, and I want to mash at 67, so the calculators for my grain bill, etc, say I do this with 9L of water at 73.6. Now this is where I get a little confused. After recirculating, then running off, I have to batch sparge. Am I right in that I continue to do multiple batch sparges, all of around 9L, until I have my required boil volume of 28.5? That would be about 3 I guess, allowing for losses? If so, what temperature do I make the sparge water ~ do I try and keep the grain at 67 for each sparge, or raise it a bit, or what? If I am trying to keep the grain at 67, say, can I use the same strike water calculator, but change the grain temp to whatever it is in the mash tun after draining (rather than ambient temp used for the first calculation)? All help gratefully received!