Oslo water

Water analysis, treatment, and mineral recipes for optimum taste and equipment health.
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homeburrero
Team HB

#1: Post by homeburrero »

There's been some recent discussion about approximating Tim Wendleboe's Oslo water, and I had a hard time googling out some reliable numbers. Once I did a google translate of https://www.oslo.kommune.no/vann-og-avl ... skvalitet/ I came across some trustworthy data:



Translating that to more familiar units we have:

Oset
total hardness: 34 - 41 mg/L CaCO₃ equivalent
calcium hardness: 33 - 41 mg/L CaCO₃ equivalent
alkalinity: 25 - 32 mg/L CaCO₃ equivalent
and conductivity of 10 mS/m would read about 50 ppm on an inexpensive (NaCl calibrated) TDS meter

Skullerud
total hardness: 40 - 50 mg/L CaCO₃ equivalent
calcium hardness: 40 - 50 mg/L CaCO₃ equivalent
alkalinity: 30 - 35 mg/L CaCO₃ equivalent
and conductivity of 11.8 mS/m would read about 59 ppm on an inexpensive (NaCl calibrated) TDS meter

Note that these have a non-carbonate hardness in the neighborhood of 10 mg/L CaCO3 equivalent. That would indicate as much as 7.1 mg/L of chloride ion if it were all chloride, or as much as 9.6 mg/L sulfate ion if it were all sulfate.

To approximate the 40:30 hardness:alkalinity values with a Barista Hustle two-bottle recipe you would use about 40 ml of the Mg solution and 30 ml of the buffer solution. Of course it's not quite the same because Oslo is all calcium and BH is all magnesium, and the BH would have about 38 mg/L of sulfate ion.

P.S.
The above numbers are also in rough agreement with what was reported here: https://www.kaffebox.no/june-kaffebox-tim-wendelboe/
Pat
nínádiishʼnahgo gohwééh náshdlį́į́h

K7

#2: Post by K7 »

Thanks, Pat.
[EDIT: question withdrawn]