There is so much on AHB on sparging, it gets overwhelming. I've been reading up on all grain, but its never as good first hand experience, so thanks PistolPatch for the effort here, much appreciated
The question i have relates to some info in John Palmers "How to Brew". He recommends a minimum grain bed depth of 10cm, but preferably 20-40cm to help filter the wort. I was planning AG recipies of 3.5 to 5kg of grain, what volume will 5kg of grain be, i.e. the grain bed volume? According to Palmer, about 2L of water per kilo of grain will give a 1:1 water to grain ratio. So 5kg of grain will give a grain bed volume of 10 litres?
It seems if want a 10cm grain bed, a pretty narrow, tall mash tun is needed?
In a 50L keg mash tun (dia. 39cm), you would need 12L of grain bed to get 10cm depth! i.e. 6kg of grain (correct me if i'm wrong), meaning i wouldn't use one until i was doing 6kg+ batches.
PistolPatch, you use a rectangular esky, what depth grain bed did you get with the 6kg of grain you used? I would doubt it was 10cm based on the surfance area of your esky/mash tun? Does it matter?
Seems a lot of AHBrewers are doing 5-6kg batches in 50-60 litre tuns?
I will batch sparging reading after this reading AHB threads, but wanted to clear something up after reading the following: :huh:
MASHING AND BATCH SPARGING
The other great thing about batch sparging, is that it is not critical where your manifold lies in the esky. Youve probably read a lot about this. Same with grain bed depth...The only thing the manifold and grain bed depth does is filter the beer. All we did was make sure my braid was lying on the bottom after we did the stir up.
So grain bed depth doesn't matter as much with batch sparging?
I know Palmer's recommendations are based on fly sparging (where grain depth and manifold design are more important for even flow rates), but I thought grain bed depth was always important, no matter what sparging method was used, as its still needed to filter/clear the wort?
I picked up a 25L willow esky ($20) to use as a mash tun cause i thought anything bigger wouldn't give me enough grain bed depth for a 5kg batch. Now i'm thinking i should have got a bigger one to give me more flexibility, like this esky here
allowing for larger batches, larger mash outs, etc.
Any help from experienced all-grainers would be appreciated