Cliff & Pebble

Is your water killing your espresso machine?

Scale is what ends espresso machines — not brand, not build quality, not what you paid. Enter a test-strip reading and find out where your water sits against the Specialty Coffee Association's range, and what to do about it.

Your reading

140 ppm

Calcium and magnesium. Drives taste and extraction.

110 ppm

Carbonates. This is the one that becomes scale.

Prefilled with an example reading from a typical municipal supply. Change it to yours.

Moderate scale risk

You will get scale, but slowly

Your alkalinity is above the SCA range. Scale will build over years rather than months. A filter that reduces alkalinity will more than pay for itself over the life of the machine.

Total hardness — SCA range 50–175 ppm 140 ppm
0100200300400 ppm

In range. Enough mineral content to extract properly.

Alkalinity — SCA range 40–70 ppm 110 ppm
075150225300 ppm

Above range. This is where scale comes from.

What to do

  1. Fit an inline filter that reduces alkalinity, not just a carbon taste filter.
  2. Descale on schedule — every 3 to 6 months at this level.
  3. Retest after any filter change, and whenever your utility changes source.
Shop water treatment

Not sure which? Call 800-410-8867 and read us your numbers.

Don't know your numbers?

Three ways to find out, cheapest first:

  • A test strip. Around $10 for a pack. Dip, wait, compare. Accurate enough for this decision.
  • Your water utility's annual report. Free. Search your city plus "consumer confidence report" — hardness and alkalinity are in there, though the figures are system averages.
  • Your softener's display, if you already have one. Remember it is treating the whole house, not the machine.

Why alkalinity matters more

Total hardness gets the attention, but carbonate alkalinity is what precipitates inside a boiler and on a heating element. It is also what buffers acidity, so too little makes coffee taste flat and sharp.

That is why very soft water is not the safe answer. Below the SCA range you trade scale for dull extraction and, in some machines, corrosion.

Ranges from the Specialty Coffee Association water standard: calcium hardness 50–175 ppm as CaCO₃, total alkalinity 40–70 ppm as CaCO₃, TDS target 150 ppm. Conversion used here is 1 °dH = 17.85 ppm as CaCO₃.

Test strips are approximate and water supplies change through the year. This is guidance for choosing treatment, not a warranty position — check what your manufacturer requires, since some warranties specify water conditions.