Books I've read state that the sparge temp should be no more than 170 degrees. I know I'm going to lose some degrees after the water goes through the plastic tube and the sparge arm. I'm looking for some advice on how to regulate the temp so it's in the proper range once it reaches the grainbed. I'm using a 5 gallon round iglo cooler for my hot liquor tank and a 10 iglo cooler for my MLT. I've been adding 5 gallons of water in the Hot liquor tank temps around 175-178 degrees "hoping" that it reaches the right temp by the time it gets to the grainbed. Am I making more out of this than need be?