I took a shot at brewing this yesterday on my BIAB system, scaled up to a 10 gallon batch:
12.1 lb Castle Belgian Pilsner
6.5 lb Marris Otter
1.4 lb Crystal 20
0.92 oz Simcoe @ 90
0.92 oz Simcoe @ 30
1.67 oz Simcoe @ 0
Since I have a 15 gallon kettle, I split my water up: 10.5 gallons for mash, 3.9 gallons for "sparge". I used 4g of gypsum, 12g CaCl, 8mL lactic acid split proportionally between the two water supplies. I use RO water as my source. Mash pH was 5.45 at the 30 minute mark.
After mashing I put the bag in my colander at the top of my kettle and poured some of my "sparge" water over it, which I had heated to 160F. Gave the bag a good squeeze, set it aside, and continued filling the kettle with my "sparge" water to 12.9 gallons (13.2 gallons @ 150F). I didn't quite use up all my 3.9 gallons of "sparge" water, as I was able to squeeze a little more wort out of the bag than expected. My boil gravity came in at 1.047.
Boiled for 90 minutes, and let the 0 minute hops addition steep for 15 minute before chilling to 72F. Took 17 minutes to go from 198F to 72F with my Silver Serpent chiller - pretty good for only being a 25' chiller.
After chilling I had 11 gallons in my kettle, of which I collected 10.5 - half a gallon more than I'd planned. Lots of trub and hops sediment in there too, though.
I still hit an OG of 1.055, had over 97% conversion efficiency, and 78% brewhouse efficiency. Late last night I pitched three rehydrated packs of US-05, and now I'm waiting for fermentation to start.
I plan to dry hop with 4.5oz 5 days into fermentation so that as fermentation tapers off it can push out any oxygen that gets introduced by dry hopping. I'll cold crash @ day 10, fine with gelatin @ day 11, and bottle @ day 12.
I like this recipe because I can use all of an 8oz pack of Simcoe for a 10 gallon batch