I think I’m somewhat in the minority with respect to the
homebrewing community, but I believe that water chemistry is criminally under
talked about. After fermentation
temperature control and yeast, I think it’s next in line to make killer
beer. And it’s gotten such a rap online
that people are terrified of it. This is
partially because it’s an extremely
complex topic that very few people fully understand, but if you can get
a few basic concepts down and don’t get bogged down in the technical and
complicated side of it, it’s pretty simple to improve your beer.
This
isn’t meant to be an in depth analysis and explanation of water chemistry in
brewing. If you want that, I highly,
highly recommend Water from John
Palmer and Colin Kaminski, braukaiser.com and a variety of forums including /r/homebrewing
and HomeBrewTalk. Brewing water is a
topic that you can spend hours and days and weeks on and still not fully
understand it. I find it’s best to not
get too bogged down in the science behind it and know just enough to get
by. This is more meant to be a quick
reference guide for myself and a way to wrap my head around this complicated
subject and hopefully other people will benefit as well.
To me,
water chemistry is about mash pH and a select few minerals which can accent
crispness, hop character, malt character and overall quality.
First
things first you need the content of your water. I asked my city for a water report and
received mine back. It looks like this:
After a
lot of reading, I found that all I need to know from this is calcium, magnesium,
alkalinity, pH, sodium, chlorine and sulfate. I
don’t have some of those, so I assumed 0 when entering into my
spreadsheet. I use BrewCipher, which
VikeMan on Beer Advocate made. It draws from a few other places to make a spreadsheet
that I find easier and cleaner to use than anything else. I’ve checked the water numbers against Bru’n
Water and they are always essentially the same.
The things my spreadsheet needs to
be inputted are Ca, Mg, Na, Cl, SO4, HCO3 and pH. These are the things I worry about when I’m brewing
and here’s a quick rundown of why.
Calcium (Brewing range 50-200 ppm)
Lowers pH, promotes clarity, flavor
and stability. Needed for alkaline water
to drop pH. Too much can inhibit yeast
performance. Flavor neutral, can reduce
sour perception of magnesium. Works in
conjunction with magnesium to define your hardness (temporary can be boiled
off, permanent cannot, this is a more in-depth subject than what I’m going into
here)
Magnesium (Brewing range 0-40 ppm)
Similar to calcium, less effective
in lowering pH. Yeast nutrient. Laxative in higher amounts (>125 ppm).
Sodium (Brewing range 0-100
ppm)
Lower levels generates a cleaner
flavor in beer. 70-150 ppm rounds out
flavors and accentuates sweetness of the malt, especially in conjunction with
chloride. High sodium and high sulfate
can be harsh/sour/bitter.
Chloride (Brewing range 0-200 ppm)
Accentuates malt sweetness and
fullness. >250 ppm can be salty,
>300 ppm can affect yeast health/fermentation. Can be minerally or salty when combined with
sulfate or sodium in high amounts.
Sulfate (Brewing range 0-400 ppm)
Accentuates hop bitterness (drier
and more crisp). >400 ppm can make
the bitterness astringent and unpleasant.
Can be added but not readily removed.
Bicarbonate sort of aka alkalinity (Brewing range 0-?? ppm)
Has the biggest impact on mash pH. Basically, higher alkalinity means you have
to add more stuff to lower the pH into range.
You could read for hours on this subject (and you should), but for now,
I’ll stop.
One of
the main reasons we care about these ions is because of mash pH. Why do we care about mash pH? Let’s let braukaiser.com
explain
“A
commonly accepted optimal range for mash pH is 5.2 - 5.7 with 5.5 being optimal
for starch conversion activity but many authors report wort and beer quality
benefits if the pH is lowered into the 5.2 - 5.4 range [Kunze, 2007][Narziss,
2005]. Kunze in particular lists the following benefits for a mash pH as low as
5.2. Since it is a good and fairly comprehensive list I cited it here. Some of
these benefits listed will be explained in the following sections [Kunze,
2007]:
- The enzymatic activity in the mash is increased as all important enzymes get activated. (except for alpha amylase which starts to suffer at a pH below 5.6)
- The extract yield (efficiency) is improved
- The protein coagulation and precipitation is improved (improved break formation)
- The run-off speed is improved
- The color increase during the wort boil is reduced
- Better trub precipitation and faster pH drop lead to faster fermentation and greater attenuation of the beer.
- The taste of the beer is more rounded, fuller and softer. The beer is crisper, more fresh and shows more character.
- The hop bitterness is more pleasant and doesn't linger
- The foam is more stable and denser
- The color of the beer is lighter
- Mash oxidation is reduced since the main culprit, the lipoxigenase enzyme, doesn't work well at low mash pH conditions
- Haze stability is improved
- Susceptibility to microbial spoilage is reduced through lower beer pH beer spoilage organism don't grow below a pH of 4.4
- Higher attenuation
Convinced
yet that brewing water/mineral additions needs to be focused on more? Since I’ve paid attention to my mash pH and
gotten it into the 5.3 range, my beer has been lighter in color and crisper
than ever before. It seems like a lot of
information but it’s been made so much easier due to the wide availability of
spreadsheets you can find online. In
case it’s still not 100% clear, I’ll walk you through how I set up my water.
My water doesn’t have much to it
and a low alkalinity so when I’m formulating my water profile the first place I
stop is Water. I look up my style, then the acceptable range
for Ca, Cl, SO4 and alkalinity (HCO3). That’s it!
Then I hop into my BrewCipher excel sheet and play around adding gypsum
(CaSO4, lowers pH, adds Ca and SO4 ions), calcium
chloride (CaCl2, lowers pH, adds Ca and Cl ions) and baking soda
(NaHCO3, raises pH, adds Na and HCO3 ions). I’ll try to get my Ca, Cl, SO4, Na
and HCO3 levels into the ranges given from Water all while keeping the pH around 5.3 (remember that study that
said to get as close to 5.2 as possible without going below? I aim for 5.3 so I have some leeway).
If I
can’t get the pH into range and the ions into range, I’ll add some lactic acid
(liquid form, buy it from any homebrew site/shop) and add that to get it into
range. Like I mentioned before, my water
has low alkalinity so I don’t have to worry about my sparge water but if I did,
I’d add lactic acid to get it to ~5.5 before sparging. You can also add more salts to the sparge or
split your brewing salts evenly between mash and sparge to get your pH in line.
Voila. That’s it.
On brew day I measure all of the minerals out, dump it in with the
grain, give it a stir then let it sit for about 10-15 minutes before taking a
sample, letting it cool and taking the pH.
If my pH is in range, great! If
it’s high, I add lactic acid, if it’s low I add baking soda, in 1 mL/1 g
increments.
I have
many thoughts and experiments planned on how to make my hoppy beers even better
and some theories on the proper water needed to brew kick ass saisons ala Hill
Farmstead (I wish), but that’s for another day.