FG going up

Hey folks, i've been pitching yeast slurry my last 6 batchs or so and i noticed the FG has been steadily going up.

Its nottingham: The first few batchs using a fresh pack finished at 1.008 - 1.009. But the last 4 or 5 using the slurry have finished 1.010 - 1.012..

The recipes while not exact are just a small tweak here and there.

Thoughts?

 

Depends on exact recipe for each, timing of fermentation, temperatures, etc. Without more information, hard to give any advice about why this might be happening.

 

Yeah, what theseeker4 said, plus with each batch those yeasties might be getting more and more stressed, so it's possible they're just not able to work as hard on later generations as they were on the first few. I only repitch for a couple batches before I buy new yeast, but I know others go as far as you do. Still, 1.012 or so is still a pretty good FG, I think.

 

It may be only a small tweak but the final gravities are only a little apart too. That little tweak might make the difference depending on what the tweak was. The difference could also be caused by a difference in the fermenting temperature or just the natural variability of how the yeast ferments. If you were normally getting a FG of 1.008 and suddenly were only achieving 1.025, I'd be concerned but such a small difference is of little consequence to me. Heck, with a few bubbles around the hydrometer, I can't even see that little difference.

 

Thanks guys, i actually measured my other batch after this post and it was 1.025. Its my first stuck fermentation. So i ordered some fresh yeast.

Just reading a little about stuck fermentations; i never used a starter, i just pour in more slurry i had in the fridge. The yeast is active i can see it. Maybe i will check the sg in a few days and take it from there. I actually do have a pack of ec 1118..

 

FWIW I'm on a 3th harvest of a Notty and I finished at .118 .012 and .020 in that order. All three were different beers so tweaks do make a difference. I will go to 4 or 5 harvests and then toss it.

I do make a facsimile of a starter..I pull my yeast slurry out of the fridge, about a cups worth or less and immediately add a cup of my second running's hot wort to it...(Yes 150+ degrees) and shake it up...it starts working within a couple min. It gets shook up several times in my 50 to 60 min boil time and then gets tosed right into my cooled wort..Activity starts in <8 hours or there abouts and is very active in 12.

 

Hey folks, my sg is moving. It went down to 1.020 since i pitched more slurry about 36 hours or so ago. I'm not really sure if it was actually stopped but it was fermenting for 9 days at that point - starting gravity was 1.050.

My experience with notty it usually is done in 5 days or so.