Question about calculating necessary amounts of water - Home Brew Forums

 Home Brew Forums > Question about calculating necessary amounts of water

05-07-2006, 01:50 AM   #1
sonvolt
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Feb 2006
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Since I have started all grain, I feel very comfortable with the process. However, I feel like I need to better understand how much water I need. I realized this when using the Recipator this evening and thinking about the portion of the spreadsheet that asks for pre-boil volume, etc.

Previously, I have always followed specific recipe directions to determine the amount of water that I need for mash/sparge/etc. Now that I have created my own recipe (hopefully), how should I go about determining amounts of water needed. For instance,

1. How many gallons of water per pound of malt should I use for the mash?
2. How many gallons of water will the grain absorb during mash and sparge?
3. How can I calculate the amount of water that will evaporate in my 60 minute boils?

If I am right, having answers to these questions should be enough so that a brewer can ensure that he has 5 gallons (or very near it) at the end of the boil.

05-07-2006, 02:36 AM   #2
Chairman Cheyco
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Dec 2005
Calgary
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Promash will do all that for you. Thr trial version is very handy and fully functional, the only thing is that it puts a limit on saves and won't let you print. Super handy for building recipes even if you don't shell-out for it.
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05-07-2006, 05:18 PM   #3
Blender

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Jan 2006
Santa Cruz, CA.
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I batch sparge and use 1.2 quarts per pound for the mash. All that I read said to figure .1 quarts per pound for grain absorbtion. As far as evaporation I think it would have to be calculated for your individual system. Promash defaults at 15%. You may also have some deadspace in the mash tun and boil kettle that has to be factored into your water calculations as well.
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Gary

05-07-2006, 06:24 PM   #4
Beer Snob

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Dec 2005
Farmington
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Quote:
 Originally Posted by Chairman Cheyco Promash will do all that for you. Thr trial version is very handy and fully functional, the only thing is that it puts a limit on saves and won't let you print. Super handy for building recipes even if you don't shell-out for it.
Just got Promash yesterday. Be sure to go to the help and do the Tutorials as they answered a bunch of questions I had when I started to play around it them.
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05-07-2006, 10:36 PM   #5

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Dec 2005
Sammamish, WA
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For the #1 - I think it depends on your equipment, beer style and your preferences, it could be somewhere in the range between 1-2 quarts/pound. Lighter beer - higher the ratio. #2 - 10 pounds of grain will hold 2 gallons of water. #3 - again, it will depend on your equipment. In my boil it would be little <1 gallon/hour
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