Heat 8 gallons of water to 160F. Add BIAB bag to keggle and clip it to edges.
Add total grains and stir to eliminate any dough balls.
Check temp, its should be around 154F, a little lower is better than too high (160F is max) if temp is too high drain some of the liquid off and add back to the grains and stir, keep stirring until you reach mash temp (154F).
Cover the keggle with a lid and let it sit for 60 minutes.
Raise temperature to 170 and let sit for 10 minutes (Mash Out).
Remove grain bag and squeeze the bag to extract more liquid. No need to squeeze all liquid out, just give it a few good squeezes.
Bring the liquid (wort) to a boil and add hops per the recipe. This is a 60 minute boil.