Iam almost done with my first ag batch with a phils sparger. The first runnings tested at 1.057 and the runnings closer to the end are 1.016. After mixing both runnings 1.031.pre-boil. with about 7.5 gal of wort. Man I like the sparge arm better then batch sparging. It did take longer but it should be worth it. I will up date in a few hours after clean up. thanks