Rehydrate yeast in pasteurized brewing water

[aeviaanah]

I'm looking to use water from HLT to rehydrate yeast. After sparge my HLT is 170F. Any reason not to pull from HLT, cool to hydration temp and rehydrate the yeast? I do not add anything to my HLT but RO water.

 

[VikeMan]

RO water is not generally recommended for rehydration, because some mineralization is needed to minimize issues with osmotic pressure.

 

[BrewnWKopperKat]

rehydrate yeast

Fermentis and Lallemand appear to have different recommendations with regard to the type of water.

https://www.lallemandbrewing.com/docs/products/bp/BEST-PRACTICES_REHYDRATION_DIGITAL.pdf : using distilled water can result in loss of viability

https://fermentis.com/wp-content/uploads/2019/10/Brochure_Tips_and_Tricks_BAT_BD.pdf : " ... it can be tap water, mineral water or distilled water, ..."

 

[KeizerBrewr]

RO/Distilled water is not something you want to rehydrate your dry yeast with. Typically your HLT should contain the same water profile as you are mashing with. So if the water has been adjusted with minerals, go for it, if not, just use some decent filtered/bottled water.

 

[aeviaanah]

I brew commercial and therefore do not dose the HLT as it's used for cleaning, sparging etc..

 

[BrewnWKopperKat]

I brew commercial

Numerous people here at Homebrew Talk have talk about having good experiences email-ing questions to either Fermentis or Lallemand.

 

[aeviaanah]

Numerous people here at Homebrew Talk have talk about having good experiences email-ing questions to either Fermentis or Lallemand.

Right on thank you