I have made two batches of brew, an amber ale and a kolsch style ale. For both I put all the extract, (LME) in at the beginning of the boil. The original boil volume was 3.75 gal. I had boil off of 27% in each case, (75 min total boil)
My questions: If I use the partial extract method do I need to worry about DMSO? If not, can I cover my boiler to reduce liquid loss? Would covering have any effect on the hops, like adding off flavors or reducing/increasing IBUs?
I think my boil might be too vigorious so I'm going to reduce it for the next batch. I also plan to add make up water to the boiler several times.
I'm still interested in the partial extract method, though.
Any hepl/thoughts will be appreciated. thanks.