CellarScience® ACID Dry Yeast | Sour Ale | Premium Beer Yeast

CellarScience® ACID Dry Yeast | Sour Ale | Premium Beer Yeast

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CellarScience® Acid Dry Yeast (500 g)
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  • Shave days off your sour beer making process by skipping the kettle souring step altogether!
  • No need for added equipment to purge your kettle with CO2 or add heating to maintain high temps for lactic fermentation
  • Pitch ACID directly into your fermenter and allow the initial "souring fermentation" to take place at typical ale yeast temps
  • Allow ACID yeast to complete both Lactic and Alcoholic fermentation on its own, or pitch a primary yeast strain to stop souring and wrap up alcoholic fermentation
  • When the pH has dropped to your desired level, simply pitch your primary yeast strain to stop lactic acid production and complete alcoholic fermentation
  • GMO-free! This natural yeast strain is hand selected for its ability to ferment and sour beer simultaneously

Consistent, repeatable results without the need for kettle souring. ACID from CellarScience is a naturally selected, GMO-free yeast strain that has the ability to ferment and sour beer simultaneously. In a traditional kettle souring process, you'll need to pre-boil wort, purge it with CO2, pitch lactic acid, wrap and seal the kettle, and insulate or provide a heat source to maintain lactic acid fermentation temps that may be as high as 100°F+ depending on your chosen pitch. ACID allows brewers to bypass those steps and produce sour beers with the equipment they already own. Pitch directly in your fermenter and allow ACID to sour your beer and begin alcoholic fermentation. Once the desired pH level is reached, pitch your primary yeast strain to halt lactic acid production and ensure the completion of alcoholic fermentation.

ACID yeast also works perfectly as a single pitch solution for both souring and alcholic fermentation. When allowed to run its course, this yeast produces a rounded, refreshingly acidic beer with light notes of fruity floral esters.

Every batch is PCR tested to ensure quality.

Pitch at the same temperature you plan to ferment at with your primary yeast strain between 66-77°F (19-25°C). Allow ACID yeast to perform the initial fermentation, producing lactic acid and lowering the pH of the beer. Once the desired pH level has been reached between 3.2–3.8, pitch your primary yeast strain to ensure the completion of alcoholic fermentation. Once your primary strain has been pitched, it will "deactivate" ACID yeast by outcompeting this souring strain and halt further production of lactic acid.

Use at a rate of 2.5–4 grams per gallon of wort. Homebrew size coming soon!

Direct Pitch or Rehydrate:
ACID yeast is designed to be sprinkled directly onto the surface of your wort with no oxygenation required in the initial fermentation. Our aerobic growth process makes this possible by creating dry yeast with high viability and high sterol levels. ACID yeast is pre-loaded with essential nutrients to ensure a successful, complete fermentation. While not required, some brewers prefer to rehydrate yeast. To hydrate yeast, first, sanitize the yeast brick and scissors. Use 10 grams of sterilized tap water between 85-95°F (29-35°C) mixed with 0.25 grams of FermStart per gram of yeast. Sprinkle yeast on the water. Allow the slurry to stand undisturbed for 20 minutes, then swirl. Use small amounts of wort to adjust to within 10°F (6°C) of wort temperature before pitching. Ferment between 66-77°F (19-25°C).

Optimum Fermentation Temp: 66-77°F
Flocculation: High
Alcohol Tolerance: 9% ABV
Attenuation: 75-80%
Lachancea thermotolerans

CellarScience Yeast:
For years liquid yeast has been sold as the higher quality option but times are changing. Yes, 20 years ago dry yeast was made by bread yeast producers and the quality was not as good as liquid yeast. CellarScience is helping to flip that script with a full lineup of high-quality dry yeasts. Cell count and viability is usually higher than commercial liquid yeast pitches, which vary from pouch to pouch and don't ship well. CellarScience yeast can be pitched directly in most batches of wort, offering significant time savings. Yeast that is quick and easy to use, high quality, and available at a reasonable cost adds up to a tremendous value. Quality yeast that doesn't "break the brink".

CellarScience Nutrients:
For high gravity ferments consider rehydrating yeast with CellarScience FermStart yeast hydration nutrient. For high gravity or low nutrient wort, feed your fermentation with CellarScience FermFed DAP Free complex yeast nutrient mix.


Community Q&A

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How do you calculate abv on this yeast if initial sugars go to lactic vs alcohol production?
Drew N on Jan 19, 2024

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