And secondly, as a more useful thanks and simply because home-barista is IMO the best place for it, I'd like to share a bonus to the handbook in the form of an excel file to calculate mixtures of three different waters.homeburrero wrote:Since around December 2016, we've been unable to get a copy of the SCAE water chart without buying an SCA membership. And the SCA provided no way to just buy the report outright.
I think that may have just changed - starting today you can buy a new SCA water handbook: https://store.sca.coffee/collections/bo ... 9334327398
Using three very different waters in terms of alkalinity and total hardness a simple but lengthy calculation can provide the respectice percentages of any mixture for a set of a target values for both total hardnss and alkalinity. Of course, the target values are limited by the choice of input waters - or visually speaking they have to have a composition lying in between the triangle that spans between the compositions of the three chosen input waters:
The excel sheet can be downloaded for free here and contains additional instructions. One caveat seems to be though, that contrary to europe, bottled waters I saw in the US did not specify the exact chemical composition of the water - just the nutritional values, where the only useful info is the calcium content in recommended % daily intake... Though for some brands the info is available online.
Additionally, the excel file includes a conversion template to calculate the concentration of total hardness and alkalinity in ppm CaCO3, starting from straight mg/L as stated on bottled water labels or water reports.
I hope it proves useful to you all and would welcome any feedback