CanAusBrewer
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- Joined
- Apr 28, 2014
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I just brewed a DIPA yesterday as a partial mash BIAB and had surprisingly low efficiency. I mashed 4.2 kg of grain in a 15.2 l pot which was filled to the rim with grain and mash water. The mash was still very wet with no dough balls and I regularly stirred it. I mashed at 67 C with a 75 C mashout for 60 minutes. I then hung the bag over the kettle and sparged with 4 litres of 75 C water in a watering can.
I boiled and added a couple litres of boiling water during the boil to account for evaporation so hop attenuation would not be reduced and added 1.5 kg light LME at 5 mins left in the boil. I then cooled for a 20 min hop stand at 75 C and cooled to 24 deg, poured through muslin, squeezed the wort from the hops in the bag and topped up to 19 l with cold tap water and checked OG which was 1.058. I ended up draining some of the wort from the tap and re-boiling with 800 g DME to get it back up to 1.070 where it was supposed to be.
I have used this brewing method before with 3 kg of grain and achieved 82% efficiency so I am really not sure what went wrong. Any thoughts? Was it too much grain in that pot for an efficient mash?
I boiled and added a couple litres of boiling water during the boil to account for evaporation so hop attenuation would not be reduced and added 1.5 kg light LME at 5 mins left in the boil. I then cooled for a 20 min hop stand at 75 C and cooled to 24 deg, poured through muslin, squeezed the wort from the hops in the bag and topped up to 19 l with cold tap water and checked OG which was 1.058. I ended up draining some of the wort from the tap and re-boiling with 800 g DME to get it back up to 1.070 where it was supposed to be.
I have used this brewing method before with 3 kg of grain and achieved 82% efficiency so I am really not sure what went wrong. Any thoughts? Was it too much grain in that pot for an efficient mash?