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Old 04-20-2012, 10:52 PM   #1
Double-R
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Mar 2010
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So been fiddling, with the spread sheets for about two weeks now. (Waiting for pickling lime).
In the "Water Adjustment Summary"
Is the Estimated Mash Ph shown at room temp. Shows 5.2 on screen shot.
Meaning that i have to bump it up to. Desired room temp Ph which is 5.4-5.6
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Old 04-21-2012, 01:38 PM   #2
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I wouldn't add any pickling lime unless you have a pH meter. Bru'n water is great and can get you close, but I always double-check the estimates with real measurements. I can't remember the last time I had to increase alkalinity to any of my mashes, even with a large amount of roasted grains.

The interactions between malt and water are pretty complex and not very easy to model. Bru'n water does the best job of anything I've found, but it's not perfect.
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Old 04-21-2012, 03:20 PM   #3
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I have to brew with RO water since I live in the land of municipally ion-exchange softened water. I can't use the tap water. My RO water quality is fairly similar to the OP's water quality above.

I find that adding alkalinity is frequently needed when the crystal and/or roast malt content is more than several percent of the grist. Having a pH meter is a nice double check and its very necessary for me since I continue to gather data for the mash acidity/pH model used in Bru'n Water.

I find that the latest acidity/pH model is now quite accurate in practical usage. That model has not been added to the existing version 1.10 that is in wide use now. It will be added to the next version.

To reinforce the validity of the model, I'll relate my last brewing session to all. I brewed an English Mild that contained 8% of an English dark crystal malt. My LHBS had Simpsons Dark Crystal in a bin and the placard said it was 77L color, but someone had marked through the color rating and written 155L in Sharpie on the bin. I tasted the malt and loved it, so I was going to use that malt regardless of the color. It turns out that Simpson also makes an Extra Dark Crystal with a 155L rating. Nobody at the shop knew if this was Dark or Extra Dark in the bin.

Overdosing your mash with pickling lime is definitely not a good idea. A lower than desirable mash pH is better than higher, so I knew that I could not assume that I had the extra dark crystal. I'd have to risk underdosing the pickling lime and add more later by assuming the 77L color rating. Bru'n Water said I needed 0.6 grams of lime in the 2.5 gallons of mash water. The resulting mash pH was measured at 5.2. That was well below the 5.5 pH that I was aiming for.

Unfortunately, I did not think about checking (before the brew session) what the lime addition would have to be if the crystal was actually 155L. So, I was flying blind with regard to how much more lime I needed in the rush of the mash. I added another 0.2 grams and the pH came up to 5.3. That was not good enough for me, so I added another 0.2 grams and the pH rose to 5.4. Good enough.

After the brew session, I had a chance to sit down with Bru'n Water and see what the predicted pH was if 155L was used as the crystal's color rating. With that color rating change and the added 0.4 grams (1 gram total), Bru'n Water did predict a mash pH of 5.4. I was surprised and relieved that the model is still pretty accurate and reliable.

The more I work with the model, the more confident I am that I can get within 0.1 pH unit of actual every time. I have pretty high control and monitoring of my raw ingredients and my results may not be typical. Therefore I'm not willing to claim that result for everyone. But its pretty safe to say that the predicted pH will be within 0.2 units every time. A brewer's water or ingredients would have to be way off to produce an error greater than that (see my result above).

The bottom line is that if you are confident in your water report and the ingredients used, when Bru'n Water says you need a certain addition, do it. Its far more likely to be right than wrong.
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Old 04-21-2012, 10:08 PM   #4
Double-R
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mabrungard,
Is the Estimated Mash Ph shown at room temp. Shows 5.2 on screen shot.
Meaning that i have to bump it up to. "Desired room temp Ph which is 5.4-5.6"
Also will be the first time using a Ph meter.

 
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Old 12-16-2016, 01:09 AM   #5
animan
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Jul 2015
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Hi, thought I would just tag a question onto this rather than starting a new post if anyone could help..

I have a (google translated) water report with the below values in mg/L. Is there any way to estimate the missing values based on these? The 'calcium, magnesium etc. (hardness)' section gives values around 55..

Many thanks!

Residual chlorine
1 General bacteria
2 E. coli
3 Cadmium and other compounds
4 Mercury and other compounds
5 Selenium and other compounds
6 Lead and other compounds
7 Arsenic and other compounds
8 Hexavalent chromium compound
9 Nitrite nitrogen
10 cyanide ion and cyanogen chloride
11 Nitrate nitrogen and nitrite nitrogen
12 Fluorine and other compounds
13 Boron and other compounds
14 Carbon tetrachloride
15 1,4-dioxane
16 cis-1,2-dichloroethylene and trans-1,2-dichloroethylene
In the case of
17 Dichloromethane
18 Tetrachlorethylene
19 Trichlorethylene
20 Benzene
21 chloric acid
22 chloroacetic acid
23 chloroform
24 dichloroacetic acid
25 dibromochloromethane
26 bromate
27 total trihalomethane
28 Trichloroacetic acid
29 bromodichloromethane
30 bromoform
31 formaldehyde
32 Zinc and other compounds
33 Aluminum and other compounds
34 Iron and other compounds
35 Copper and other compounds
36 Sodium and other compounds
37 Manganese and other compounds
38 chloride ion
39 calcium, magnesium etc. (hardness)
40 evaporation residue
41 anionic surfactant
42 Geosmin
43 2-Methyl isoborneol
44 Nonionic surfactant
45 Phenols
46 Organic matter (amount of preorganic carbon TOC)
47 pH value
48 taste
49 Odor
50 chromaticity
51 Turbidity

 
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