Why scale in a coffee machine is critical, and citric acid saves the budget

A coffee machine with tubes and a heating element clogged with scale works like a person with chronic bronchitis: slowly, intermittently and at risk of breakdown. Scale reduces the service life of equipment by 30–40%, increases energy consumption and spoils the taste of coffee - the bitter taste and metallic smell appear precisely because of calcium and magnesium salts deposited on the internal surfaces. Manufacturers recommend using branded decalcifying products (for example, De'Longhi EcoDecalk or Miele Entkalker), but their price is 5–10 times higher than that of citric acid, which copes with the task no worse.

Citric acid is the only folk remedy approved by service centers for regular maintenance of coffee machines (at the right concentration!). It dissolves carbonate deposits without damaging rubber seals and plastic parts, unlike vinegar or soda. However, accuracy is important here: a solution that is too weak will not remove scale, and a solution that is too strong can damage metal elements. Next, we’ll look at how to choose proportions, avoid mistakes and extend the life of your Jura E8, Saeco PicoBaristo or another model.

How often should you descale: water hardness table

The frequency of cleaning depends not on the model of the coffee machine, but on the hardness of the water in your region. In Moscow and St. Petersburg, water is considered to be of medium hardness (4–8 °dH), and in Yekaterinburg or Novosibirsk it is considered very hard (12–18 °dH). If you use tap water, check its hardness using test strips (available at pet stores for aquariums) or on the website of your local water utility.

Water hardness (°dH) Cleaning frequency Signs of the need for urgent decalcification
Less than 4 Every 3–4 months The coffee flows slower than usual and the heating element is noisy.
4–8 Every 2 months A white sediment remains at the bottom of the cup, the coffee tastes bitter
8–12 Every month The machine often overheats and the overload protection trips.
More than 12 Every 3–4 weeks The coffee does not heat up to the required temperature, the scale indicator is constantly on

If you use filtered or bottled water, the frequency of cleaning can be reduced by 30%. For example, for water with a hardness of 6 °dH, instead of cleaning once every 2 months, once every 3 months is enough. But remember: Even distilled water does not guarantee the absence of scale — microparticles of salts may remain in it.

📊 What kind of water do you use for your coffee machine?
Tap
Filtered (jug filter)
Bottled
Distilled

Proportions of citric acid: how much is needed for your model

The key mistake for beginners is to use a packet of citric acid from the store “by eye”. The concentration of the solution depends on water tank volume your coffee machine. For example, for De'Longhi Magnifica S with a 1.8 liter tank, more acid will be required than for Krups EA8108 with 1.2 l tank. Optimal proportions:

  • 🍋 For a 1–1.5 l tank: 30–40 g of citric acid per full tank of water (concentration ~2–2.5%).
  • 🍋 For a 1.5–2 l tank: 50–60 g of acid (concentration ~2%).
  • 🍋 For professional machines (tank 2.5 l+): 80–100 g, but it is better to divide it into 2 cleaning cycles.

Important: if the instructions for your coffee machine indicate that it "does not tolerate acid cleaners", use lactic acid (sold in pharmacies) in the same concentration. It is gentler on aluminum parts. To check the water hardness in the car, some models (for example, Melitta Caffeo Solo) have a built-in test - run it before cleaning.

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If you don't have a kitchen scale, use a measuring spoon: 1 heaped tablespoon of citric acid ≈ 25 g.

Step-by-step instructions: how to properly clean a coffee machine

The decalcification process takes 30–60 minutes and consists of 3 stages: preparation, cleaning and rinsing. Never stop a cycle halfway through - this may cause scale particles to clog the valves. If the machine has an automatic cleaning function (for example, Philips Series 3000), use it, but with manual control of the solution concentration.

Make sure there are no coffee beans or capsules in the machine|

Remove the water filter (if equipped)|

Fill the tank 2/3 full with water|

Add citric acid and stir|

Prepare a container for collecting waste liquid (volume of at least 1 l) -->

  1. Starting a cleaning cycle:

    Turn on the machine and wait until it warms up. If there is a "decalcification" mode (Descale Mode), activate it. If not, start the hot water supply mode (Hot Water). Drain the first portion of water (100-150 ml) - it may contain remnants of old scale.

  2. Basic cleaning:

    Place a container under the coffee spout and pour out the solution in 200–250 ml portions, pausing for 2–3 minutes. This is necessary so that the acid has time to dissolve the deposits. Repeat until you have used up half the solution in the tank.

  3. Flushing:

    Drain off the remaining solution, rinse the tank with clean water and fill it to the maximum. Run 2-3 hot water cycles to remove any remaining acid. B Saeco and Gaggia After washing, you need to additionally rinse the cappuccino maker (if you have one).

What should I do if the machine locks during cleaning?

If your coffee machine stops responding to commands after descaling begins, don't panic. Unplug it for 10 minutes, then plug it back in. Most models (Bosch Tassimo, Nespresso Vertuo) have an emergency reset: hold down the power button for 15 seconds. If the blockage remains, call a technician, as the overheating sensor may have tripped.

5 mistakes that ruin your coffee machine when cleaning

Even experienced users sometimes miss important details. Here the most dangerous mistakesthat lead to breakdowns:

⚠️ Attention! If, after cleaning with citric acid, the coffee becomes sour, you did not flush the system properly. Run an additional 2-3 cycles with clean water, otherwise the taste will spoil for a long time.
  • 🔥 Using vinegar instead of citric acid. Vinegar is aggressive to rubber gaskets and leaves a persistent odor. B Jura and Miele this may cause a leak.
  • ⚡ Interrupting the cleaning cycle. If the solution is not drained completely, scale residues may clog the pressure valve (especially in Krups with the system Thermoblock).
  • 💧 Using cold water. The acid is only effective at temperatures above 60°C. In machines with preheating (Smeg) this is not a problem, but in budget models it is better to heat the water in advance.
  • 🔄 Cleaning without rinsing. Residues of acid corrode the metal. B De'Longhi this can damage the heating element within 2–3 months.
  • ⚖️ Wrong proportions. Too strong a solution (more than 3%) damages aluminum parts in Gaggia Classic and Rancilio Silvia.

If after cleaning the machine begins to make noise or takes longer to heat up than usual, check to see if there are any air pockets left in the system. To do this, start the steam mode (Steam) for 10–15 seconds.

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After cleaning with citric acid, always make a test coffee and drain it - the first 50-100 ml may contain residual solution.

Why is citric acid better than professional products?

Branded cleaners (eg. Urnex Dezcal or Puly Caff) cost 5–10 times more than citric acid, but their benefits are often exaggerated. Let's compare:

Criterion Citric acid Professional products
Cleaning cost 10–20 rub. per cycle 200–500 rub. per cycle
Efficiency Dissolves up to 90% of scale Dissolves up to 95% of scale (due to surfactants)
Safety for parts Safe at the right concentration May contain aggressive rubber components
Cleaning time 30–60 minutes 20–40 minutes (faster due to catalysts)
Smell after washing May leave a slight sour taste Neutral

The main advantage of professional products is they often contain corrosion inhibitors, which protect metal parts from oxidation. If your coffee machine is older than 5 years or has an aluminum boiler (as in Francis Francis X1), it is better to alternate citric acid with branded cleaners (for example, 2 times acid, 1 time De'Longhi EcoDecalk).

The design of coffee machines of different brands has nuances that affect the decalcification process. For example, in Nespresso You cannot drain the solution through the coffee spout - only through a separate hot water tap. And in Jura After cleaning, be sure to reset the water hardness counter in the settings menu.

  • 🔧 De'Longhi (Magnifica, Dedica, La Specialista): Use the mode Descale on the menu. After cleaning, press and hold the button Menu 5 seconds to reset the scale indicator.
  • ☕ Nespresso (Vertuo, Essenza, Pixie): Clean only through a hot water tap! The capsule mechanism is not designed to come into contact with acid.
  • ⚙️ Saeco (PicoBaristo, Incanto, Aulika): Before cleaning, remove the cappuccino maker and rinse it separately. In these models, the steam wand often gets clogged.
  • 💡 Jura (E8, E6, Z6): After rinsing, start the program Rinse 2 times and reset the water meter to Settings → Water hardness.
  • 🔥 Bosch (Tassimo, VeroCafe): Do not use acid more than once every 2 months - these machines have thin silicone gaskets.

For carob coffee machines (for example, Rancilio Silvia or La Marzocco Linea Mini) the cleaning process is more complicated: you need to disassemble the boiler and soak it in the solution for 1–2 hours. Here it is better to trust a master if you have no experience.

What to do if scale is not removed

If after 2-3 cleaning cycles the scale indicator is still on or the coffee is only coming out in a thin stream, the problem may be more serious:

⚠️ Attention! If you hear a loud hissing sound when you turn on the machine and the water does not heat up, this is a sign that scale has completely blocked the heating element. In this case do not try to clean it yourself - the risk of short circuit is too high. Contact service.
  • 🔍 Check the water filter. In models with a filtration system (Miele CM 6) a clogged filter can simulate scale. Rinse it under running water.
  • 💦 Use an ultrasonic cleaner. For heavily clogged parts (e.g. sprayer in Krups EA89) an ultrasonic bath with a solution of citric acid (10 g per 1 liter of water) will help.
  • 🔧 Disassemble the coffee spout. In 70% of cases, slow flow is caused by a blockage in this part. Rinse it with a syringe needle.
  • 📞 Contact service. If the machine gives an error E05 (in De'Longhi) or ERR (in Saeco), this may indicate a breakdown of the temperature sensor due to scale.

In the most advanced cases, specialists use phosphoric acid (in diluted form), but this is an extreme measure - it corrodes the solder joints. If your car is under warranty, do not experiment: contacting an unofficial service may void the warranty.

FAQ: answers to frequently asked questions

Can I use lemon juice instead of citric acid?

No. Lemon juice contains only 5-8% citric acid, the rest being water, sugars and oils. For effective cleaning you will need at least 1 liter of juice, which is impractical. In addition, sugars can settle on parts and attract bacteria.

How much does professional cleaning cost?

The cost depends on the model and degree of contamination:

  • Budget coffee machines (De'Longhi Dedica, Krups Essenza): 1,500–2,500 rub.
  • Middle class (Jura E6, Saeco PicoBaristo): 3,000–5,000 rub.
  • Professional devices (La Marzocco, Nuova Simonelli): from 7,000 rub.

The cost usually includes disassembly, ultrasonic cleaning and replacement of seals (if necessary).

Why did the coffee start to taste bitter after cleaning?

This happens for three reasons:

  1. Poor rinsing - acid residue interacts with the coffee, giving a bitter taste. Run 2-3 more cycles with clean water.
  2. The scale has damaged the heating element - the water does not reach the required temperature (optimally 92–96°C), and the coffee is not extracted correctly.
  3. The nozzles are clogged - if the water flows too slowly, the coffee will be over-extracted. Clean the spout with a needle.
Is it possible to clean capsule coffee machines (Nespresso, Dolce Gusto) citric acid?

Yes, but with reservations:

  • Use a solution of low concentration (15–20 g per 1 l).
  • Do not drain the solution through the capsule mechanism - only through the hot water tap.
  • After cleaning, rinse the system 3-4 times, as capsule machines have a lot of plastic parts that can absorb odors.

For Dolce Gusto It's better to use a branded product Nescafé Dolce Gusto Descaler - it has a softer effect on rubber gaskets.

How often should I clean my coffee machine if I use distilled water?

Even distilled water contains trace elements that form plaque over time. Optimal frequency:

  • When using distilled water: once every 4–6 months.
  • When using reverse osmosis water: once every 3 months.

Remember that the complete absence of minerals in water can lead to corrosion of metal parts, so some manufacturers (for example, Miele) it is recommended to add special mineral cassettes to distilled water.