Cleaning Tablets vs Descaler: What's the Difference?
Updated
They solve opposite problems and cannot substitute for each other. Cleaning tablets are a detergent that removes coffee oils from the brew path. Descaler is an acid that removes mineral scale from the water path. Using one when you need the other achieves nothing at all.
Two different residues
Coffee oils build up wherever coffee flows: the shower screen, the group, the three-way valve, a bean-to-cup brew group. They go rancid and make every subsequent shot taste bitter and stale. A detergent dissolves them.
Scale builds up wherever water is heated: the boiler, the thermoblock, the internal plumbing. It insulates the heating element and narrows passages until flow stops. An acid dissolves it.
Neither product touches the other's problem. Detergent does nothing to limescale; acid does nothing to coffee oil.
Schedules
Detergent: roughly monthly for home use, via a backflush with a blind basket on machines with a three-way valve, or a brew-group cleaning tablet on a bean-to-cup machine.
Descaler: every one to three months depending on water hardness, using the manufacturer's approved solution and the machine's own program if it has one.
Getting it wrong
The most common mistake is running a descaling cycle because the coffee tastes bitter. Bitter is usually oils, not scale, and the descale will not change it.
The second most common is never descaling because the machine still works. Scale gives no warning until flow drops, and by then the deposit is substantial.
Never mix the two products or run them in the same cycle.
Related on espresso.compare
Frequently asked
- Can I use cleaning tablets to descale?
- No. Tablets are a detergent for coffee oils; descaling needs an acid for mineral deposits. They are unrelated chemistries.
- How often should I use each?
- Detergent roughly monthly, descaler every one to three months depending on water hardness.
- Do bean-to-cup machines need both?
- Yes. They have a brew group that accumulates oils and internal plumbing that scales, and most prompt for each separately.
- Is a generic cleaner fine?
- Usually, if it is sold as an espresso machine cleaner. What matters is not using a household detergent, which is not formulated to be safe in a brew path.