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**All Grain Brewing / All grain partial boil and IBU's**

« **on:**April 08, 2012, 02:44:50 PM »

I am starting to think about what to brew at our clubs Big Brew Day.

Last year with so many people brewing, trying to chill was a challenge with the lack of water pressure for my chiller.

I was considering doing a partial boil and topping off with cold water.

I can figure out for example how many ibu's I'd get with a one hour boil for a final volume of 3 gallons @ 1.080

Then top off with 3 gallons of cold water to get six gallons @ 1.040.

If I calc the ibu's of the 3 gallons at 80 does that mean the ibu after the top off water is 40?

Last year with so many people brewing, trying to chill was a challenge with the lack of water pressure for my chiller.

I was considering doing a partial boil and topping off with cold water.

I can figure out for example how many ibu's I'd get with a one hour boil for a final volume of 3 gallons @ 1.080

Then top off with 3 gallons of cold water to get six gallons @ 1.040.

If I calc the ibu's of the 3 gallons at 80 does that mean the ibu after the top off water is 40?