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Water for espresso in South Africa

Cape Town tap is soft, Johannesburg is hard, and neither is ideal. What to do about it without a chemistry degree.

20 August 2026 · 7 min read · Black Coffee Lab

Scale is the number one reason machines come to our workshop. Hard water in Gauteng will fill a boiler with limescale within a year of daily use.

Very soft water has its own problem: flat, lifeless shots and, in some boilers, corrosion. Aim for 50–100 ppm total hardness with some alkalinity.

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