Got the brew day! Split batch - Brett Saison and APA.
Grist:
5.5 kg China-malted Australian 2-row (pppg 1.031 - lots of protein)
3 kg Chateau Pils
1 kg Chinese wheat malt
.5 kg Chinese biscuit malt
Water: 45 L RO water, with 12 g gypsum, 4 g calcium chloride, 1 g salt. 22.5 L for mash, 9 for sparge, 13.5 refrigerated for top-off.
Mash:
5 kg mixed grist in 22.5 L mash water, 66.7 C, acidified with 10 ml 80% lactic acid, roughly 80 minutes.
Sparged first grain bag with about 4 L hot sparge water, drained, and started second mash with remaining 5 kg grist. Insulated and left overnight. Sparged with remaining 5 L sparge water (hot) in the morning and started boil. Pre-boil: 27 L @ 21 Plato
Boil:
50 minutes.
40g Sorachi Ace at FWH.
20g each El Dorado, Amarillo, and Simcoe at 10 minutes.
Quick chill to 60 C (overshot target temp of 70+) for hop steep: 80g El Dorado, 30g Amarillo, 30g Simcoe.
Left it alone (save the occasional stir) for about 1.5 hours while I was busy with something else.
Ran chiller for half an hour while I was still busy with something else.
Post-boil: roughly 24 L @ 23p
Siphoned about 14 L to saison fermenter with one 4.5 L jug of chilled top-off water.
Siphoned/dumped remaining ~10L to APA fermenter (with hop sludge) with 9 L top-off water.
Both fermenters were shaken before topping off for a bit of O2.
Pitched vitality starter of Belle Saison and stepped-up Boulevard Saison Brett dregs in saison.
Pitched vitality starter of US-05 in APA.
Over-chilled, especially with the top-off water, so I'm waiting for my heating wire to bring the fermenters back up to ferm temps. At 12 C right now, targeting 17 C for first three days, then bump up 1 C a day until 20 C.
Dry Hops:
APA @ 3 days: 20g each El Dorado, Citra, Simcoe.
APA @ 10 days: 30g El Dorado, 10g Citra, 20g Simcoe.
Bottle at 2 weeks.
Brett Saison @ <1 week until packaging (probably 3-4 months): 50g each El Dorado and Amarillo, 20g Citra.
The dregs of the Saison Brett were stepped up with a starter wort-strength wort of DME and a bit of Sorachi Ace for preservative about 4-5 months ago, no shaking. The starter beer smelled AMAZING when I removed the sanitized foil to pitch the dregs into the saison wort, very winey. I poured the first 12 ounces of clear starter beer into a thick ceramic flip top with some white sugar for a (hopefully) tasty little freebie in a few weeks.
This was my best brew day in a while. The iterated mash is a winner for these split batches. WAY better than doing one thick mash and big sparge. Overshooting my chilling before the steep wasn't necessarily ideal, but it might work out well by way of preventing excessive bitterness from that fairly big addition, and the extra hour of steeping while I was busy should have helped with the flavor and aroma extraction. The excessive chilling pre-pitch is something to keep an eye on as well next time, but overall it's been a very successful and satisfying split brew day.