I recently did a Dopplebock/Bock partigyle with a 20 minute acid rest @ 101F. The PH was @ 5.2 at the end of it. No dark malts & a total of ~21 gallons of well water with no adjustments. I think the acid rest is key. I could have adjusted the water & skipped the acid rest but I was attempting to do it "old school". The first decoction was stepped to 162F for 30 minutes & boiled for 40 minutes then added back for 150F rest for 45 minutes. Then a thin decoction was pulled & boiled through the hot break & added for the mashout. They're both lagering now and initial samples are tasting good. Cheers!!
Malt:
19.5 lb. Munich
7 lb. Pilsner
6 lb. Vienna
Carafa II was added for color right after the 1st decoction was pulled.
water:
pH 7.6
Total Dissolved Solids (TDS) Est 274
Electrical Conductivity, mmho/cm 0.46
Cations / Anions, me/L 5.2 / 5.1
measured in ppm
Sodium, Na 7
Potassium, K 5
Calcium, Ca 77
Magnesium, Mg 10
Total Hardness, CaCO3 234
Nitrate, NO3-N 1.0
Sulfate, SO4-S 3
Chloride, Cl 5
Carbonate, CO3 < 1
Bicarbonate, HCO3 287
Total Alkalinity, CaCO3 236