A little under 10 pounds of grain .....filled the mash tun with hot water while I heated up the actual mash water ( 3 GALLONS). Got the mash water to 170+- degrees and dumped the water out of the tun and poured in the mash water...added the grains and stirred it up and the temp read 150+- degrees ( hard to be EXACT with this thermometer but 150-152) put the top on and covered it with a blanket....got my hops ready and heating the sparge water in two seperate pots right now. I will get my first run and figure out how much sparge water I need ......then we are off to the boil... I cannot believe how excited I am......like a kid at christmas.. I GET TO USE MY WORT CHILLER!!!! LOL