0
votes
1answer
64 views

Can I re-aerate in the Primary?

Is there a downside to shaking the primary fermenter to re-suspend the yeast if the fermentation is going slowly?
0
votes
1answer
89 views

May I Aerate AFTER Pouring Yeast into the Carboy?

I extract brew, and the kits I buy from NB tell me to add cold water to the wort to get a total of 5 gallons, and then aerate before adding the yeast. However, if I do this I will always have more ...
1
vote
1answer
331 views

What is the proper way to supplement a yeast starter with oxygen via an aeration stone?

I have two yeast starters going on my two homemade stir plates. The stir bar or the stir plate for one of them is malfunctioning and I can not increase the speed enough to get a vortex going. It is ...
1
vote
1answer
253 views

Yeast Starter Vortex Size

I've read online that the size of the vortex in a yeast starter does not matter. Why is this true? When I was experimenting with water yesterday, I created a monster vortex (very cool) and could see ...
1
vote
3answers
2k views

Can Dried yeast function at a low temperature?

I started my first batch of home brew lager around 24hrs ago I aerarted it and it was at 20 Degrees celcius but does not appear to be fermenting..... I know people say I have to give it time as I read ...
5
votes
2answers
207 views

oxygen and yeast pitching rates

Many online references, such as BYO, mention that oxygen is needed by yeast to reproduce, and that a wort with low dissolved oxygen levels will have longer lag times and less attenuation. This might ...
0
votes
2answers
5k views

Fermentation started, then stopped the next day. Is my yeast dead?

This is my first shot at homebrewing, using Northern Brewer's American Wheat Beer kit which is based on liquid malt extract, Willamette and Cascade hops, and a packet of dry yeast. I brewed and put ...
11
votes
5answers
1k views

Is it necessary to aerate wort when pitching onto an existing yeast cake?

To my knowledge, aeration provides oxygen so that the yeast can reproduce before fermentation. If you're pitching onto an existing yeast cake, there should theoretically be enough yeast already to ...
10
votes
3answers
323 views

Is aeration necessary if you overpitch?

We all know that aeration is necessary for yeast growth. Does it facilitate more than that? If you massively overpitch, on a previous yeast-cake for example, do you need the same amount of dissolved ...