Recently started doing all grain brews in my igloo cooler. So far the results have been tasty! But I really do not know anything about what I am doing regarding efficiancy and technique. I add water to my MLT at about 190F to warm the cooler and add in the grain when it cools to around 160F. When I mix the grain in and take a temp I am around 154F. Then I let sit for an hour, drain off about 2-3 gallons into a container and the rest into the boil pot. Add the 2-3 gallons back in, add .5 gallon sparge water per pound of grain at 170F, close lid and let sit for 20 min. Drain MLT into boil pot and get to boiling.
Like I said, results have been good so far and spot on for my Beer Tools recipes, but I have no idea if I am making any mistakes, or could be doing it better. I know technique is arguable, but I am interested in some feedback on this method. So far my brews have been IPA, pale ale's and cream ales.