Franconian Keller Lager (FKL)

(3 customer reviews)


BBFKL – Franconian Keller Lager

Availability: Now available year-round!

Source: A unique lager strain from a Franconian Keller Lager beer

This tantalizing lager culture has never before been released commercially.

A subtly rich and malty backbone balances out the surprisingly crisp finish accentuates any traditional German lager style. Emphasizes noble hop aroma and bitterness for maximum crispness.

Embrace the nuance of an unrefined, lightly sulfured and hazy lager by packaging and serving after primary fermentation.

Ferment at traditional lager ferm temperatures 50F-55F (10C-13C) for 2-6 weeks with a diacetyl rest before crashing or additional lagering.

Ordering Information:

🚀🚀🚀 This homebrew culture qualifies for FAST Flat Rate Shipping (2 Day Air) with NO order minimum!

Please note that temperatures may vary wildly during shipment and after delivery. We highly recommend shipping to a person/location that can immediately refrigerate the culture once delivered.

Before ordering, please read Bootleg Biology’s homebrew culture shipping policy. By ordering cultures, you are agreeing to this policy. Thank you!

In stock (can be backordered)

SKU: BBFKL Categories: , Tags: , , , ,


Catalog: BBFKL – Franconian Keller Lager

Brewing Info*:

  • Type: Saccharomyces pastorianus monoculture
  • Pitching Rate: 5 GALLON BATCHES SHOULD BE MADE WITH AT LEAST A 500ML STARTER OR TWO HOMEBREW PACKS OF FKL WHEN FERMENTING AT LAGER TEMPERATURES. Directly pitchable into 2.5 gallons of 1.050 or lower wort at lager temperatures.
  • Estimated Attenuation: 79-85%
  • Estimated Final pH: 4.3-4.5
  • Flavor/Aroma Profile: Bready, Malt-Forward, Light Sulfur
  • Flocculation: Low; Higher with prolonged aging
  • Recommended Fermentation Temperature: Lager Range: 50F-55F (10C-13C)

Product Category: Bootleg BETA

This culture is part of our Bootleg BETA program. We have done limited testing and are not ready to officially release this culture. So let us know what you think! If it’s awesome…or you hate it..leave a comment on the product page. If you like it, we might rerelease this Bootleg BETA culture officially.

Additional information

Weight.1875 lbs
Dimensions5 × .5 × 8 in

3 reviews for Franconian Keller Lager (FKL)

  1. SHANE MOCK (verified owner)

    I’ve brewed with virtually all of the commercially available German lager yeasts but I think I’ve found my new favorite. It’s subtly malty, lets the hops come through elegantly and with an underlying bready note. It took about 2 months to “clear,” (I use the term clear quite loosely), but always maintained classic German unfiltered lager characteristics while still having a clean taste. I brewed a 5 gal batch with 7 lbs Czech Pilsner Malt, 4 lbs BestMalz Red-X, traditional step mash, hopped with 1 oz Tradition at first wort, 0,5 oz Perle at 60 min, 1 oz Spalter at 25 min and 1 oz each of Tettnanger and Spalter in the whirlpool. Delish

  2. Steve Daniel (verified owner)

    I brewed a LODO country helles with this yeast based on the Brewing German Helles paper. The recipe called for sauergut culture at knockout which was also used. The resulting beer was astonishing to say the least. It was as good as any German lager I’ve ever tasted, and the best beer I’ve ever made. Incredible malt flavor and aroma along with the grapey German “it” factor from the sauergut. The first keg blew in a week because we couldn’t keep away from it. The second keg had a seal leak which wasn’t discovered until after lagering. Evidently air got in because the beer had developed a prominent diacetyl flavor component. So my advice is to take great care not to introduce oxygen into your process post-fermentation because this yeast will produce diacetyl if given a chance. I’m giving this beer five stars based on the first keg. The second keg was my fault. This will be my go-to helles yeast from now on.

  3. cmmckelv (verified owner)

    I have used this in a few beers now and it has been great in them all. First I went with a zwickel which was great and the most recent was in a gratzer. The yeast is very versatile, going from the unfiltered zwickel to a crystal clear gratzer that took first place in the historical beer category in a recent homebrew contest hosted by the Maltose Falcons.

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