I plan on brewing the Chainbreaker IPA recipe from Zymurgy next weekend. It calls for a step mash: 15 minutes at 125, 15 minutes at 145, 20 minutes at 163 and 5 minutes at 172. BeerSmith assumes I am going to heat the mash tun directly, but since I mash in a cooler, well, you know. . .
I found a couple of calculators online that tell me to add 19.11 quarts at ~134 to hit my first step, the 6.6 quarts for the second, 10.6 for the third and 8.9 for the last. That's a total of 45 quarts of water added to the mash for a 6 gallon batch. That sounds a bit off to me.
The way I see it, I have two choices: First, divide that 19.11 into 4 additions (which I don't know how to do); Second say Phaqit and just do a single infusion mash with 19.11 quarts.
Anyone have any advice?