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I finally got a chance to use my SD boiler and rims to do a biab wash.
I plan to use this thread to document my progress. Please feel free to post any advise as it would be greatly appreciated.
I did a peated whisky wash yesterday using 12kg of pale malt and 8kg of peated malt. I mashed for 90min @ 66c in 100l of half reverse osmosis water and half tap water. PH is usually around 7. One thing I totally forgot to do was to check pH during the mash just for my own reference. You get 100% conversion @ 5.4 pH usually
I managed to get all the 20kg into the bag. Because of the 8in opening in the top of the SD 120l boiler, I knew it would be impossible to pull the full bag of wet grain out, so I spent around 10min spooning the wet grain out into another grain bag set up to drain. It was the only downside of using the boiler, but positives far out way having to scoop out for 10min. Maybe try a bigger spoon.
I sparged with 10l @ 80c, mashed out @ 75c for 10min then set the controller to 100c. I managed to get to 90c with the rims until I switched off the element. When I use this set up for beer I will have to supplement the rims with another element to achieve a rolling boil but 90c is perfect for a wash. I ran the wash through a plate chiller and got 84l into the fermenter @ 1.056sg. Oxygenated with O2 and airstone for about 1 min. Pitched with still spirits whiskey yeast and ec 1118 combo.
Things to consider next time.- Check mash pH and adjust. Start with 110l of strike water and possibly 2-3 kg more grain. Sparge with 15l as spent grain was still fairly sweet. This should bring me up closer to 100l into the fermenter. Try a different yeast.
My gear is a SD 120l boiler, SD rims tube and 3600w element, cheap no name heat rated mag drive pump, custom made whirlpool return inlet, olddog controller, 30plate chiller, various SD fittings.