Double Mash Biab 1/2 then 1/2 - please advise water treatment?

Post #1 made 1 year ago
[font=helvetica, arial, sans-serif]I'm planning a Big Stout and I going to have to split my grain bill and I'd really appreciate your help.[/font]

[font=helvetica, arial, sans-serif]Related BYO article :- [/font][font=helvetica, arial, sans-serif]https://byo.com/bock/item/1317-reiterat ... sive-brews[/font]

[font=helvetica, arial, sans-serif]My plan is to mash 1/2 then this will require 33 litres of water and remove the grain. Sparge to make up to initial volume (33 litres), and then mash the other 1/2 in the wort from the first 1/2..   Sparge again to get to the correct pre-boil volume.  [/font]
[font=helvetica, arial, sans-serif]Continue with processing in the usual way.[/font]
[font=helvetica, arial, sans-serif] [/font][font=helvetica, arial, sans-serif]But I don't know about water treatment.[/font][font=helvetica, arial, sans-serif] [/font]
[font=helvetica, arial, sans-serif]I'd very much like to get decent efficiency and for that I need the correct treatments.[/font]
[font=helvetica, arial, sans-serif]If I treat just the 1st mash then the treatment for the 2'nd 1/2 will be wrong so what  do I do?  [/font]
[font=helvetica, arial, sans-serif] [/font]
[font=helvetica, arial, sans-serif]Thanks for your help.           aamcle[/font]
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Last edited by aamcle on 01 Jan 2017, 07:08, edited 5 times in total.
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Re: Double Mash Biab 1/2 then 1/2 - please advise water treatment?

Post #4 made 1 year ago
I'm making a huge stout far to big for my equipment, the reiterating method involves splitting the grain into two in my case aprox 5kg and 5kg and then mashing the first portion as normal but with out a mash out step.  The grain is lifted out of the kettle but the still active enzymes and the sugars from the first portion are in the wort in the kettle. 
This enzyme rich wort is used as the mash water for the second portion of grain. So in all there are two mashes done.
There is a Basic Brewing Radio Podcast about the procedure (year 2007) but it's not using BIAB, a similar double mash can be done with BM to get more volume or higher gravity.
In the research I've been done I have found no references to extra water treatment other than that one brewer who added some Calcium Carbonate which as you say is barely soluble.  So I not inclined to bother with additional treatment.
I'm still thinking about the best way to convert Reiterated Mashing to BIAB, so far my thought is to wash the grain from the first mash and use the resulting weak wort to wash out the grain from the second mash. 
I hope to get decent efficiency but I'll have some LME on standby.

aamcle
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Re: Double Mash Biab 1/2 then 1/2 - please advise water treatment?

Post #9 made 1 year ago
I wouldn't treat the water unless you have an accurate water report of your existing water. Or, if you are going to use RO water and then build a water profile specific to the brew. If that's the case you can use Brun Water to get the profile you want. I  haven't used it on a brew myself,  I've played around with it but it seemed complicated and my beer turns out decent without playing around with my water.
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