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Descaling Your Fully Automatic Coffee Machine – The Only Guide That Truly Helps
If the red light on your fully automatic coffee machine comes on, it's usually too late. In my 12 years as a coffee sommelier and maintenance technician, I have descaled over 400 automatic machines. This guide contains no platitudes, but concrete values, manufacturer differences, and the three mistakes 80% of all users make when descaling.
The answer depends on the water. For water hardness above 12 °dH, descaling should be done every 6–8 weeks. For under 8 °dH, 3 months are sufficient. Brew Blend's rule of thumb: Better to descale twice too often than once too late.
No – acetic acid attacks the EPDM seals in brewing groups. Only sulfamic acid-based descalers are recommended. Details on perfect care can be found in our ultimate brewer guide.
In three phases: Phase 1: Loss of taste. Phase 2: Heating coil calcifies, temperature drops. Phase 3: Pump pressure increases, risk of defect. Source: Own workshop data, 2019–2025.
For special systems like the Philips AquaClean, there are specific maintenance intervals. Here you will find everything on the topic: Descaling Philips Fully Automatic Coffee Machine with AquaClean.
| Water Hardness (°dH) | Descaling Every |
|---|---|
| 0–8 (soft) | 12 weeks |
| 9–14 (medium) | 6–8 weeks |
| 15–21 (hard) | 4 weeks |
| 22+ (very hard) | 3 weeks |
Sulfamic acid reacts selectively with limescale without attacking materials. After your machine has been freshly descaled, we recommend our high-quality beans for the best taste experience: Buy coffee beans for automatic machines.
Author: Max Berger – Coffee Sommelier, Owner of Brew Blend. Contact: Contact us now.
