What is the Third Wave Water recipe?

Third Wave Water (TWW) is an American brand that sells mineral concentrate sachets to dissolve in demineralised or reverse-osmosis water, creating an ideal mineral profile for coffee. The recipe targets roughly 150 mg/L total TDS with a precise balance of magnesium, calcium and bicarbonates, within the SCA's recommended ranges.

Water makes up 98 to 99 % of a cup of filter coffee, and its mineral composition directly influences extraction. Magnesium ions (Mg²⁺) enhance the extraction of fruity and floral aromas; calcium (Ca²⁺) adds body but can harden the profile; bicarbonates (HCO₃⁻) act as a buffer and neutralise acidity — too few and the cup becomes sharp and aggressive, too many and the organic acids that bring life to the coffee are blunted.

The SCA recommends for coffee water: total TDS between 75 and 250 mg/L (ideally around 150), calcium hardness of 17-85 mg/L, pH of 6.5-7.5 and alkalinity (carbonate) of roughly 40 mg/L. Finding tap water that ticks all these boxes is rare; mineral content varies widely across Belgium and most of Europe.

Third Wave Water was founded in the United States around 2016-2017 by a group of passionate hobbyists to address exactly this gap. The concept is simple: start with neutral water (distilled, demineralised or reverse-osmosis — thus mineral-free) and dissolve a precisely dosed mineral sachet. TWW offers two main ranges: 'Classic' (aimed at filter and balanced espresso) and 'Espresso' (richer in calcium, designed for semi-automatic machines). The Classic Profile target composition is often quoted: roughly 85 mg/L magnesium, 17 mg/L calcium, bicarbonates around 40 mg/L.

The DIY alternative is possible and popular in the advanced community: magnesium chloride, potassium bicarbonate and magnesium sulfate can be purchased from pharmacies or specialist suppliers, then prepared as concentrated stock solutions for dilution. Recipes circulate freely online — notably those popularised by Australian barista and educator Barista Hustle — allowing full parameter control at a fraction of the cost.

In practice, the most demanding users have their local water analysed (or use a TDS meter plus KH test strips), then adjust their recipe accordingly. The cup impact is real and measurable: with identical coffee, same roast, same protocol, water can radically transform aromatic expression — particularly clarity, length and perceived acidity.

Coffee water profiles: comparison