Re: RE: Re: SMB Dose for NO Sparge
Posted: Sun Oct 09, 2016 9:12 pm
Techbrau wrote:It completely depends on your system. If, for example, you are not using caps for your mash/lauter, then you probably will have minimal sulfur left post-boil. If you have close to zero total O2 ingress during the entire hot side processing, then you will still have some sulfite left post-boil with 50 mg/l SMB.
I understand everyone's will be a little different. Next, would it be beneficial to have a small amount left post ferment?
Re: SMB Dose for NO Sparge
Posted: Sun Oct 09, 2016 10:55 pm
Commercially, it is generally accepted that a small amount of post-fermentation sulfite is desirable and helps keep the beer fresh. The target that Kunze and Narziss both state is 10 ppm sulfite in the package, which also happens to be the maximum allowable amount that the beer can have before it needs to have the "Contains Sulfites" text on the label.
In Germany where they follow the RHG, these sulfites need to come from the yeast because they're not allowed to add SMB. Hence the preference for lager strains which produce sulfur during the ferment. However, both Narziss and Kunze state that it's commonplace in other countries for breweries to add SMB or KMB at packaging to hit the 10 ppm mark. This is especially common in cask ales in the UK, where the maximum allowed limit as actually 30 ppm.
When I and others have measured commercial German lagers from the bottle with sulfite test strips, we've measured them to typically be around 10 ppm, and sometimes as high as 20 ppm. Of course, the strips aren't the most accurate thing in the world, but I think that it at least does demonstrate that yes, the commercial examples have in the neighborhood of 10 ppm and it's by design.
I have seen some people report problems with too much excess sulfur, especially with ale yeast. Lager yeast seem to be much more effective at consuming excess sulfite left over post boil. However, other people have used 100 mg/l SMB in a no-sparge mash with no problems at all. The simple fact is that every system and process is different, and some brewers tend to get a lot more oxygen pickup when they brew - this is what makes a "one size fits all" guideline so difficult and why low oxygen brewing is all about fine tuning your individual system through trial, error, and measurement.
I've mentioned before and still believe that the ultimate goal of anyone interested in getting serious about low oxygen brewing should be to tighten up the system as much as possible so that they can get away with as small of a dose of SMB as possible. If you are brewing no-sparge with a pseudo-closed system (i.e. floating caps on the wort in the mash and lauter tuns like I use in my system), have zero leaks whatsoever in your pump lines, dough in with no aeration, and do nothing else at all which introduces a significant amount of oxygen into the wort, then you should be able to get away with 30-40 mg/l SMB, maybe even less.
IMO the goal should boil down to this: Get cold, un-oxidized wort in the fermenter with ~10 ppm or less residual sulfite. Pitch your yeast, aerate, and ferment. From the end of fermentation onwards, do everything humanly possible to avoid the slightest bit of contact with air.
Re: SMB Dose for NO Sparge
Posted: Mon Oct 10, 2016 2:33 pm
Oxygen is the peril of every brewer. Narziss is quite subtle about this, whereas Kunze is VERY forthright!
I've been to some smaller breweries websites (Bavarian) where they are less cagey of their product.
They literally state: "our secret is that the brewmaster takes uttermost care not to let the wort come in contact with air from the mash tun to the bottling"
Sadly I didn't bookmark these, so you have to accept it on faith.
To me the "resurrection" of sulfites in the mash is the most elegant and efficient way for home brewers to replicate the beers they love (hopefully from my state).
With some luck it may even give rise to some beautiful interpretations once the basics are mastered.
It's almost a year ago that I tried SMB for water treatment in the mash. I got serioulsy edged on by Tech and Bryan. The results spoke for themselves. Once I tasted the wort and saw the result there was no shadow of a doubt that this was an incredibly simple and efficient approach for us, the fringe of the brewing community, to finally get closer to our goals.
Soon it's time to toast the anniversary of our labour! No faith is needed, the results speak for themselves.
Not yet, but soon it'll be "Prosit LI" !