Hi folks. This is my first attempt at all grain BIAB, I am having some difficulty trying to calculate what my strike water and subsequent sparge water volumes should be. I have a 30L Ace boiler (see below image). I'm keeping it small and simple for my first go, aiming for a 12 litre batch. 60 Minute Mash in, 10 Minute Mash Out and 60 minute boil. I have tried various calculators but get quite different results each time, perhaps I am doing something wrong. Any help you can give me would be very much appreciated. :) My grain bill is: 3kg Maris Otter. 200g Caramalt.