#### ohiobrewtus

##### Well-Known Member

I would then sparge both mashes until the total volume of remaining first runnings and sparges totals 6.5 gallons for *each* mash, resulting in the collection of three 6.5 gallon worts to be boiled.

I don't have the grainbill or hopbill nailed down yet, but I'm having trouble wrapping my head around how to calculate estimated OG of the two partigyle batches - which is obviously needed to predict IBUs. For the sake of calculations, assume that the target OG is 1.120.

I've done a couple of searches on and off today but haven't been able to locate a good source for this information. Anyone have any suggestions?