Re: Att koka bort syre ur kallt kranvatten
Postat: lördag 2019-01-26 08:52
Och sammanfattar man dessa förstår man att marginalerna är väldigt små. Förkoka ordentligt, kyl direkt, tillsätt en syreätare, mäska in extremt försiktigt och använd mash cap. Slarva eller skippa en så kan du lika gärna mäska in med äggvispen.. Ingen har sagt att LoDO är speciellt roligt eller lätt...
What follows is a summary of key values related to DO content and mitigation:
Tap/RO water can be saturated to ~8-12 ppm
O2 solubility is ~4-5 ppm at mash temperature
Pre-boiling/yeast scavenging can reduce DO levels to ≤ ~0.5 ppm
Pre-boiling alone does not provide active protection against DO
Metabisulfite (NaMeta or KMeta, SMB or PMB) or the use of a pre-packaged or DIY “Trifecta” (Meta, AA and Gallotannins) alone does not provide sufficient margin
Dough-in can add ~1-3 ppm DO
Atmospheric diffusion rate of O2 is ~1-2 ppm/hr
< 1 ppm DO during hot side is desired
< 0.5 ppm DO during hot side is ideal (provides margin)
Copper, Brass and Aluminum can introduce potential for oxidation reactions
Brewtan B may serve to mitigate these reactions (collective experience is showing this to be accurate)
< 0.15 ppm DO during packaging is desired for maximum flavor stability
What follows is a summary of key values related to DO content and mitigation:
Tap/RO water can be saturated to ~8-12 ppm
O2 solubility is ~4-5 ppm at mash temperature
Pre-boiling/yeast scavenging can reduce DO levels to ≤ ~0.5 ppm
Pre-boiling alone does not provide active protection against DO
Metabisulfite (NaMeta or KMeta, SMB or PMB) or the use of a pre-packaged or DIY “Trifecta” (Meta, AA and Gallotannins) alone does not provide sufficient margin
Dough-in can add ~1-3 ppm DO
Atmospheric diffusion rate of O2 is ~1-2 ppm/hr
< 1 ppm DO during hot side is desired
< 0.5 ppm DO during hot side is ideal (provides margin)
Copper, Brass and Aluminum can introduce potential for oxidation reactions
Brewtan B may serve to mitigate these reactions (collective experience is showing this to be accurate)
< 0.15 ppm DO during packaging is desired for maximum flavor stability