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Batch Sparging Calculations

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All Grain Brewing Introduction
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Dry Yeast Starter
Splitting a Whitelabs yeast
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Fly Sparging
Batch Sparging Calculations
Batch Sparging
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This page will show how to calculate the amounts of water required.

Batch sparging is the process which rinses the grains by adding two lots of water in batches.  The brew which was used on this occasion was the pilsner version of the lager on the all grain recipe page.  The recipe was changed to assume 72% effiency because of the lower yield which has affected home brewers recently.  Here is the revised recipe.
Pilsner Malt     3018g
Carapils Malt    432g
Flaked Maize    432g
Brewing Sugar  432g
All the other details of the recipe are unchanged, it is only the grains we are concerned about here.
The first stage is to calculate how much water you will need for each stage, including the amount of water which was used in the mash.  Fortunately there is an excellent calculator available online on Jim's beer kit forums in the calculators section. To find it, go to the links page on this website, click on the Jim's beer kit link, then calculators.
Here is the calculation I used for this brew.  I printed a copy of it to keep handy while the brew was in progress


The calculator is easy to use. Enter your brew size in the required box; in this case it was 23 litres.

Enter the percentage loss in the required box, in my case it is 15% as it was a 90 minute boil.  Had it been a 60 minute boil I would have entered 10%.

Enter your estimated loss in the required box.  You will need to know this from your own system, mine is 2 litres.

Enter the total grain bill in the required box.  Mine came to 3.882g, the calculator rounded this up to 3.9 as shown.  If your brew contains sugar, please remember not to add this to the grain bill as the sugar is not mashed.

Enter your mash tun dead space in the appropriate box. To determine this is simple.  Connect the strainer to your mash tun and put some water into it.  I used around 10 litres myself.




I then drained the mash tun until the water stopped running from the tap.  There was a small amount of water remaining in the mash tun.




I then poured the remaining water in the mash tun into a jug and measured it.




The amount collected in the jug was a quarter of a litre; this is the amount that I need to enter in the appropriate box.  I entered 0.25; the calculator changed it to 0.2.

Enter the mash water to grain ratio in the appropriate box.  I used 2.5 litres of water for each kg of grain; therefore I entered 2.5 in the box.

Then press the calculate button and you will have your water amounts calculated for you.  Now I have this information it's time to start sparging.

Please go to the next page, batch sparging.


Next Page.

All the information given on this website is from my own personal experiences and are well tried and tested.  However, if you try something you have seen here and it does not work out, I accept no responsibility for any loss, damage or injury that may occur.