Lager fermentation advice

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Lager fermentation advice

Postby timtoos » Thu Apr 26, 2018 07:21

Hi all,

I have a lager on at the moment, OG was 1052 and 25L, and was pitched with WLP800 yeast. Temperature is nice and steady at about 12.2C.

I made 2 xstarter's of 3L each with OG's of 1035 (keeping a little back for another beer) but the amount pitched was very adequate according to the yeast pitching calculators.

Anyway, the wort was brewed on 14/4 and now, after 12 days my gravity is still at 1.020. I have a tilt in my fermenter and I have cross checked this against a sample and its reading correct. The beer has been around this gravity for about 4 days now. Last night I gave it a gentle stir in the hope of encouraging some movement - but this morning there's no change.

When I lifted the lid there was still a good krausen head on the beer and the racking cane was still bubbling away, a bubble every 1 second.

Whats people opinions here? Should I be increasing the temperature to help fermentation and start the diacetyl rest early?

Lagers are new to me so any advice is greatly appreciated. It just seems to me that fermentation has stalled.

The sample tasted sweet as expected at this gravity.

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Re: Lager fermentation advice

Postby Steviebobs1983 » Thu Apr 26, 2018 07:56

I reckon 12 days in you could raise to 18°c gradually by 1° every 12 hours and you won't get any off flavours

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Re: Lager fermentation advice

Postby Saccharomyces » Thu Apr 26, 2018 08:14

I’d follow Noonan’s guidance on lagering:

Leave it until it reaches 1/3 OG, rack it to a secondary or lagering vessel and then decide what to do. It will keep chugging away for another week or more. It is probably synthesising enzymes to excrete and chew up the more complicated sugars.

You can wait for the PG to reach 1.006 above target FG then do a diacetyl rest 12->16 C for two days before cooling, or wait for it to pretty much finish and slowly lower the temp to 5 C, hold for a fortnight and then lager at 0-1 C.

If the beer was mashed to give more dextrins, the latter strategy is preferred.
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