from james Hoffman's book "how to make the best coffee at home", actually adapted from Jon Gagne "physics of filter coffee" grindscience : above: NaHS04 should be NaHCO3. Alkanity should be 27.6ppm /mk alkalinity , or 595.6 ppm for each g of Sodium Bicarbonate added to 1L of water. Anyways, this looks rather like a concentrate, ( 1000 times too strong) barista hustle diy water recipes, the world in two bottles Recipe 4 – Barista Hustle Water Recipe 48.8g Buffer 19.4g Mg 931.8g DI water The original Barista Hustle water recipe — where it all began. Add an extra gram of the Mg concentrate and you’re at the top limit of the SCA specifications. Barista Guild of Europe Chris Kornman's practical water guide above: Making Custom Water Formulas>>>> last row should be Potassium Bicarbonate(KHCO3), second last row should be Sodium Bicarbonate(NAHCO3) 40ppm Ca2+ (as CaCO3) ÷ 681.2 = 0.0587 g /L ...