Who this is for / not for
For: You’ve read our descaling basics page and know how to descale, but want a real answer to how often beyond “it depends.”
Not for: Your machine has a built-in hard-water sensor or descale-reminder light — that’s a better signal than any generic schedule, this page included.
60-second verdict
| Your water is… | Descale roughly | How to know |
|---|---|---|
| Soft | Closer to your manual’s stated default interval, or longer | A water hardness test strip reads low, or your utility’s water quality report states low hardness |
| Moderate | Somewhat more often than the default | Mid-range test strip result |
| Hard | Meaningfully more often than the default — don’t just wait for symptoms | High test strip result, or visible scale/white residue around faucets and kettles at home |
Why “every 3 months” as a universal rule doesn’t work
Manuals publish a default interval assuming an average water hardness that doesn’t match every household. Hard water accelerates scale buildup significantly faster than soft water does, which means the same fixed interval can be overkill in a soft-water area and genuinely too infrequent in a hard-water one — by the time you’re seeing symptoms (a flow or pressure problem, see our no-pressure diagnostic), scale may already be established internally.
The fix is testing your own water once, not guessing from your address. A cheap water hardness test strip tells you where you actually sit, and you adjust your manual’s default interval shorter (hard water) or can leave it as-is (soft water) from there.
What we refuse on this page
- A single universal number (“descale every X weeks”) — that’s exactly the guessing this page exists to replace.
- Specific test-strip reading thresholds without reconfirming them against a current product’s own scale — hardness scales can differ between test kit brands.
FAQ
My manual already gives me an interval — do I still need to test my water? It’s worth it if you’ve never checked — manuals assume average conditions, and many households are meaningfully harder or softer than average.
Does using filtered water change how often I need to descale? Yes, generally lengthens the safe interval — see our water guide for why filtered water helps on this front specifically.
What happens if I descale too often? Generally low risk beyond cost and inconvenience, as long as you’re using a manufacturer-approved descaler and following the manual’s process — unlike under-descaling, which risks the machine itself.
Update log
| Date (ET) | Change |
|---|---|
| 2026-10-19 | Initial publish. |