I'm on the fence and need a push on which method to go with. I've done both with mixed results. I recently did back to back fly sparges with very different extractions. The first was around 79%. The second was around 60%. Same LHBS milling the grains, same brewing set-up, same procedures. I lautered both at about 1 qt every 2 min. and always kept the grain bed covered. My thoughts were that my pH was off during the lauter or my HLT temp dropped quite a bit. I didn't monitor either during the sparge....distracted with domestic duties. I have a 10 gal cylindrical cooler for a mash tun and a 7.5 gal aluminum HLT set up on a gravity tier system. Not ideal for doing a mash-out or maintaining a consistent temp on the sparge water. Any tips on doing a mash-out other than adding x gallons of boiling water to get to 168 before I lauter? I'm worried about mash tun space for big beers and adding excessive water that is not pH adjusted. I boil the water in an electric tea pot. Or should I just go back to batch sparging? I started fly sparging to improve extraction on big beers but I have not been able to dial it in yet.