Gaggia Classic Descaling Guide (Classic Pro & Evo Pro)

The Descaling Guide Your Gaggia Classic Actually Needs

Gaggia's own instructions for the Classic Pro (RI9380) are unusually strict: "Use the GAGGIA descaling product only… Never use vinegar or other descaling agents." It asks for a descale every 2 months. Even if you use purified or bottled water, it still recommends descaling every 2-3 months. The cycle uses half a bottle of Gaggia descaler, a 20-minute soak, and then four tanks of fresh water to rinse. Gaggia also warns that not descaling can void the warranty.

This guide follows the Classic Pro RI9380 (SIN035R) operating instructions step by step.

---

How to Know When Your Gaggia Needs Descaling

The Classic Pro has no descale light. Descale on a schedule:

---

What You Need

• Gaggia descaler (you use half the bottle per descale)
• A large container of at least a litre for the steam wand and brew unit
• Fresh drinking water
• Time for a 20-minute soak and four tanks of rinse water

Not vinegar, and not citric acid or other descalers. Gaggia rules out "vinegar or other descaling agents".

---

Step 1: Prepare the Machine

1. Remove the filter holder by turning it from right to left.
2. Remove and empty the water tank. Take the drip tray out first, then pull the drain pipe downwards to free the tank.

---

Step 2: Add the Descaler

1. Pour HALF of the Gaggia descaler bottle into the tank.
2. Fill the tank with fresh water up to MAX.
3. Refit the tank, with the silicone tubes inside it and not twisted.

---

Step 3: First Pass

1. Switch on with the on/off button.
2. Dispense 2 cups (about 150 ml each) from the steam wand: container under the wand, open the steam/hot water knob, press the brew and steam buttons together, then stop the same way and close the knob.
3. Dispense 2 more cups (about 150 ml each) from the brew unit by pressing the brew button.
4. Switch off.

---

Step 4: Let It Soak for 20 Minutes

Leave the machine switched off for about 20 minutes so the descaler can work.

---

Step 5: Run the Rest of the Solution Through

1. Switch on. Dispense 2 cups from the steam wand, then 2 cups from the brew unit.
2. Switch off and leave it off for 3 minutes.
3. Repeat this until the tank is completely empty.

Warning from Gaggia: "Never drink the descaling solution or any products dispensed until the cycle has been carried out to the end."

---

Step 6: Rinse, Four Tanks in Total

1. Rinse the tank and fill it with fresh drinking water. Empty the drip tray.
2. Container under the steam wand; open the knob; press brew and steam. Run the whole tank through the wand. Stop with both buttons and close the knob.
3. Refill the tank. Lock the filter holder in (align the handle mark with the icon, turn left to right).
4. Container under the filter holder; press brew and run the whole tank through the brew unit. Stop with the brew button and empty the container.
5. Remove the filter holder and rinse it.
6. Repeat this rinse from point 1 once more, for a total of 4 tanks.

---

Step 7: Refill and Reload the Circuit

Refill the tank with fresh water. If necessary, load the circuit: with no filter holder, put a cup under the brew unit and press brew until water flows. If no water comes, run a cup of water through the steam wand with the knob open to clear the air, then try again.

The descaling cycle is now complete.

---

Cleaning Between Descales

Gaggia's manual pairs descaling with a short cleaning routine that keeps coffee flowing:

After more than 2 weeks unused, Gaggia's first-use flush applies: run a whole tank through the steam wand (knob open, brew and steam buttons), then a whole tank through the brew unit with the filter holder in.

Safety: the drain hose can get very hot during use, which is why Gaggia says to clean the tank only with the machine off. Never immerse the machine in water.

---

Other Gaggia Classic Models

• Classic Evo Pro: we haven't read a separate Evo Pro manual, so follow the manual that came with your machine.
• Pre-2019 Gaggia Classic: we haven't read that manual either. Its steps may differ from the Classic Pro's, so check your own instructions.

---

Preventing Scale Build-Up in the First Place

• Descale every 2 months with Gaggia descaler, or every 2-3 months with purified or bottled water.
• Use purified or bottled water, which Gaggia recommends for taste.
• Wash the filters daily, and soak them in boiling water for 10 minutes if brewing goes wrong.
• Brush the screen regularly and run hot water through it.
• Load the circuit after more than 2 weeks unused.

---

When Descaling Doesn't Fix the Problem

If coffee still won't come through after descaling, work through the rest of Gaggia's malfunction table: water in the tank, a filter not clogged by too-fine or over-tamped coffee, and a clean screen. Our Gaggia Classic Pro not working guide covers each. After that, contact your Gaggia dealer or an authorised service centre.

---

FAQ

Can I descale my Gaggia Classic with vinegar or citric acid?

Gaggia says no: "Use the GAGGIA descaling product only… Never use vinegar or other descaling agents." It also warns that not descaling may void the warranty, so use Gaggia descaler.

How often should I descale my Gaggia Classic Pro?

Every 2 months according to the manual. Even with purified or bottled water, Gaggia still recommends descaling every 2-3 months.

How much Gaggia descaler do I use?

Half the bottle, topped up with fresh water to the MAX line of the tank.

How long does descaling a Gaggia take?

Gaggia doesn't give a total time. There's a 20-minute soak, 3-minute pauses while you run the solution through, and four tanks of rinse water.

Do I need to load the circuit after descaling?

If water doesn't flow normally afterwards, yes. With no filter holder fitted, press brew until water comes out of the brew unit. If it doesn't, run water through the steam wand with the knob open to clear the air.

---

Related Gaggia Guides

• Gaggia Classic Low Pressure
• Gaggia Classic Pro Not Working
• Gaggia Classic Pro Maintenance Guide
• Gaggia Classic Leaking Water

Sources: Gaggia Classic Pro RI9380 (SIN035R) operating instructions (US edition, 2022).