Originally Posted by brewkinger
What is your equipment setup?
Play it safe and use 1.33 qts per pound of grain
10.75 * 1.33 = 14.3 quarts (3.6 gallons) for the mash
For a 5 gallon batch, I usually boil about 6.5 gallons to get 5.25 into the fermenter.
(by the way, forget the 10 min mash out)
Subtract the volume of your first runnings from 6.5-7 gallons and that is the amount of sparge water you will need.
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I basically do this but I need 7 gallons to end up with 5.25. Every system will have a slightly different boil off rate. It took me a few brews to hone in on the correct amounts.
I also sparge with about half of the difference, measure and fine tune the total preboil volume with the second sparge addition. Not really necessary but it works for me and I don't come up short or leave much in the tun.