The question we are asked the most... How often do I have to descale my machine?

Why Descaling Your Coffee Machine Matters More Than You Think

Here at ECS Coffee we see it, here it and experience Scale everyday. It is the number one question we are asked about maintenance and the number one issue for our service department. And once you invest in a quality espresso machine or coffee maker, there’s a silent problem building inside your machine that most people never see—until it’s too late.

It’s called scale.

What Is Scale?

These pictures were taken from our own service department. This is a commercial machine but it is easier to show what a water tank looks like when it is a bit bigger.

Scale inside a water tank     Scale we removed from a tank   Cleaned descaled tank

Scale comes from minerals in your water—primarily calcium and magnesium—that are invisible when dissolved. Think Mineral or Spring water. You can’t see them, but they are there. The moment you heat that water, those minerals solidify and stick to the internal components of your machine.

Over time, they build up on:

• Water tanks
• Internal lines
• Heating elements (coils/boilers)
• Sensors

This buildup forces your machine to work harder just to do its job, wearing out the components over time. And here is how.

What Happens If You Don’t Descale?

Think of scale like plaque in your arteries, but for your coffee machine.

Here’s what it does:

1. Slows Heating Performance

Scale insulates heating elements, making it harder for your machine to reach the right temperature. If your heating element is covered in this rock like substance, the heat needs to get work through that before it gets to heat your water.

2. Reduces Accuracy

Temperature sensors can’t read properly when coated in mineral buildup. That means inconsistent brewing. When your sensors are covered in this substance, the machine may not be able to tell the water temperature which could make the machine boil over or not heat enough.

3. Affects Taste

Poor temperature control = under-extracted or bitter coffee.

4. Shortens Machine Life

The machine strains to compensate, which leads to premature failure of many of the components.

The Hidden Cost of “Good” Water

A common mistake is assuming all water is safe for your machine.

You should avoid:

• Well water (The worst)
• Spring water (The second worst)
• Hard tap water (common in many regions)

Even if it tastes great, it can be loaded with minerals that accelerate scale buildup.

The Best Water to Use

To reduce scale:

• Distilled with added minerals (like third wave water) → No scale, but the minerals espresso likes
• Remineralized Reverse Osmosis (RO) water → Good, but not perfect
• Filtered water → Better than tap, but still contains calcium and other minerals that cause build up

👉 Important note: Espresso and coffee needs minerals! Distilled or non-remineralized RO water does not have enough minerals and can cause damage to your machine by leeching minerals our of your boiler. 

How to Know If You Need to Descale

You don’t need to open your machine to figure it out.  For starters most machines will tell you when it needs descaled. This is sometimes sensor related but other times it is based on timing to brew the beverage. When the message comes on, it is time to descale. But you can usually tell just by looking at the machine. Here is how.

Check your cold water reservoir (the one you pour the cold water into):

• Do you see white residue on the side of the tank?
• Does the surface feel gritty like sandpaper when you run your fingers along it?

If yes → It’s time to descale.

What Descaling Actually Does

Descaling removes the hardened mineral deposits from inside your machine, restoring:

• Proper heating performance
• Accurate temperature readings
• Better-tasting coffee
• Longer machine lifespan

It’s one of the highest ROI maintenance habits you can have.

How Often Should You Descale?

It depends on your water:

• Hard water → Every 1–2 months
• Filtered water → Every 3–4 months
• RO water → Every 6-8 months
  
• Or Whenever the machine tells you to!

The Bottom Line

Most people don’t replace their coffee machine because it’s “old.”

They replace it because it’s scaled.

If you:

• Use the right water
• Check your reservoir regularly
• Descale consistently

You’ll get:

• Better coffee
• Fewer repairs
• Years more life from your machine

If you run a coffee setup at home or in a business, descaling isn’t optional, it’s part of making great coffee. And the best machines in the world? They still fail without it.

So check your product manual, as most brands have a recommended descale, Or buy a generic. There are a lot on the market and most will work. But don’t use vinegar. It really doesn’t work that well and unless you like Fish and Chips flavoured coffee….by a proper descale