wort aeration

[Factor]

I just let my wort splash like crazy and foam up as it goes into the carboy (hose stops at the opening).
I reuse yeast and my beer comes out great.

 

[RPh_Guy]

Yeast need oxygen at the start, unless using dry yeast. While there are other possible aids to sterol synthesis, they of course all have some downstream downside. But I know you know all this... am I missing a big point you're making? You do have an understanding of microbiology that surpasses my practical, brewing oriented grasp.

I'm not an expert on this matter. I have more questions than answers.

Here's what I think we know:

Oxygen helps yeast grow. It's extremely beneficial during propagation i.e. when making a starter.

Increased oxygen level at pitching results in a more rapid fermentation.

All other endpoints examined in scientific literature seem to have conflicting evidence and/or the methods have questionable application to homebrewing.

My takeaway is this:

There's clearly not always a need to aerate or to achieve any particular level of oxygen in the wort. In other words, there's no one-size-fits-all. Pitch rate, yeast vitality, yeast strain, wort gravity, trub content, headspace, and other factors all come into play and probably have a greater effect on fermentation performance than oxygen level.

Most research indicates that oxygen suppresses ester formation. Therefore in some cases (most Belgian styles, Saison, weissbier, etc.) low oxygen levels may be beneficial to increase the desired yeast flavor.

In other cases aeration/oxygenation is likely beneficial or at least not harmful.

 

[BrewnWKopperKat]

I only use dry yeast. ( US-05 95% of the time.) I brew ales & IPA's. So I just want a clean fermenting yeast. So if I use dry yeast, I don't need to aerate the wort then?

As a followup to what @Silver_Is_Money said/quoted, here are some links worthy of "old school" bookmarking:

• Q&A web page: https://fermentis.com/en/tips-n-tricks/questions-and-answers/
• Link to Tips & Tricks: https://fermentis.com/en/tips-n-tricks/for-you-brewers/
  
• Link to product information sheets: https://fermentis.com/en/fermentation-solutions/you-create-beer/

Lallemand: https://www.lallemandbrewing.com/en/united-states/products/brewing-yeast/

Mangrove Jacks: https://mangrovejacks.com/collections/craft-series-yeasts

 

[ReaperOnefour]

Thanks again fellas for all your feed back. I'll be brewing my mosaic IPA this afternoon. I've never used mosaic hops before. So this should be interesting. Hopefully it turns out great.