How much StarSan is too much?

Discussion in 'General Brewing Discussions' started by Donoroto, Jun 22, 2022.

  1. Donoroto

    Donoroto Well-Known Member

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    I mix StarSan at 1 ounce for 5 gallons. In my kegs, the dip tubes are cut 1/2" short. I store my kegs clean and pressurized, with a gallon of StarSan solution in them. I empty the StarSan using a picnic tap, then pressure transfer from the fermenter into the keg.

    I'd like to hear your opinion on the 4-6 ounces of StarSan left behind in the keg (because the tubes are shortened) and its effects on the beer. Thanks!
     
  2. Minbari

    Minbari Well-Known Member

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    I do 2oz to 5 gallon. But being a mild acid, i don't store it in the kegs. I just let them dry after I clean em, then rinse with starsan before refill.

    I would upend them to get the last bit out before a refill though.
     
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  3. HighVoltageMan!

    HighVoltageMan! Well-Known Member

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    I don't think it will change the beer much, maybe lower the pH of the beer a bit, which isn't a bad thing. I kind of have the same situation with one of my kegs, I just shake it at the end of emptying it to get as much of the Starsan out as possible.
     
  4. Megary

    Megary Well-Known Member

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    Are you sure it's only 4-6oz?

    While I agree that it shouldn't have an impact on the finished beer, I also would be looking for a way to get rid of it. Once, ok. But every time you keg a beer, pass.

    Just my opinion.
     
  5. jschein

    jschein New Member

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    I usually turn the keg upside down and release the prv to get the last of the starsan out
     
  6. Over The Cliff Brewing

    Over The Cliff Brewing Well-Known Member

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    I turn the keg upside down for a few seconds to drain every bit I can before I put beer in. There will be some left unless you dry it.
     
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  7. Donoroto

    Donoroto Well-Known Member

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    Ok, thank you! Great comments!

    I store the kegs on CO2 so they are pre-purged, meaning I am loath to open it. But pulling the inverted PRV is brilliant @jschein and that is what I will do.

    @Megary It might be only 1-2 oz., but I think I should experiment and measure so I know for sure. I'll do that when I keg Josh's Bitter and just re-purge the keg.
     
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  8. Ward Chillington

    Ward Chillington Well-Known Member

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    4 to 6 oz to 5 gallons? Not quite a teardrop in the ocean but I've read and heard that the stuff acts like a nutrient to the yeast. There's a recent Brulosophy episode on this where they discuss silly big amounts of Star San getting into a batch and testers could not pick the offending beer! Try episode 234...
     
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  9. Trialben

    Trialben Well-Known Member

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    I one racked a Porter onto maybe 2 litres of Posphoric acid sanitizer.
    Somehow I thought the keg was purged I found out when beer was spilling out the lid and I had a couple of liters left in the fermenter.
    Well that beer got dumped.
    I carbed it and tasted it and it was just super thin and I could bare drinking it knowing it had all that sanitizer in it...
     
  10. The Brew Mentor

    The Brew Mentor Well-Known Member

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    Flipping the keg and pulling the prv is great idea and similar to what I do with my Sankey kegs.
    In the end, I feel better about not having anything left in the keg except CO2.
     
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  11. Donoroto

    Donoroto Well-Known Member

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    My first dumper, documented somewhere on this forum, was the same thing: forgot to drain the sanitizer. Yeah, a couple ounces might be fine but a couple gallons, nope.
     
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  12. Trialben

    Trialben Well-Known Member

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    I rekon the PRV is a great option.
    I always give my purged kegs a shake to hear if there's any solution left Inside. None always but if ever I'll be inverting and pulling the PRV great info.
     
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  13. Donoroto

    Donoroto Well-Known Member

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    Got maybe 3 oz out by pulling the prv after emptying the keg if sanitizer using the tap. Shook the keg and didn't hear splashing, so I'm calling it good.

    Kegged the Josh Bitter for tonight's meeting.
     
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