Calculate the ideal ratio between two mineral waters and mineralize water for coffee within the SCA hardness and alkalinity standard.
The water blend calculator shows the exact ratio to mix two mineral waters and reach the ideal water for specialty coffee, within the hardness and alkalinity range recommended by the SCA.
It is a practical way to mineralize water without weighing salts: you pick two off-the-shelf waters, usually one harder and one lighter, and the tool calculates how many parts of each to use to hit your hardness (GH) and alkalinity (KH) target.
The result appears on a chart comparing your mix with the ideal zone, and you can save or share the water recipe.
It is the mix of two mineral waters in calculated proportions to reach the ideal hardness and alkalinity for extracting specialty coffee, without handling salts.
Few ready-made waters are already at the ideal point. Combining a harder water with a lighter one lets you tune the final composition into the SCA standard or another target. It also saves money on buying salts and precision equipment.
No. The blend works by proportion between bottled waters, so you only measure volumes. To start from distilled water and add salts, use the remineralization calculator (Vitória Régia).
Calcium, magnesium and bicarbonate values are usually on the bottle label in mg/L. The tool converts everything to ppm of CaCO₃ automatically.
The SCA points to around 68 ppm hardness and 40 ppm alkalinity as a balanced extraction target, with low sodium. That said, it is worth stressing that these figures are SUGGESTIONS, not an absolute truth. TEST it!