Automatic liquid soap dispensers from Xiaomi (for example, Mijia Smart Liquid Dispenser or Viomi models) S1/S2) They've become a popular solution for bathroom and kitchen hygiene, but many users are faced with the problem of how much soap to put into the device so that it doesn't malfunction or fail early. An error in the choice of means can lead to clogs, breakage of the pump or even corrosion of internal parts.
In this article, we will analyze the criteria for choosing liquid soap for Xiaomi dispensers, analyze compatibility with various formulations (from antibacterial gels to children's products), and give a step-by-step instruction on refueling, taking into account the nuances of specific models, and pay special attention to the hidden risks of using inappropriate liquids - for example, why soap with abrasive particles or high pH can spoil the mechanism in a few weeks.
If you're already struggling (the dispenser doesn't give out soap, flashes red, or makes strange noises), there's a section at the end of this article on diagnostics and how to save the device, and for those just planning a purchase, we've compared Xiaomi to Redmond and Rubetex, so you know exactly if you should be paying for the brand.
Why you can’t put the first soap you get
Xiaomi dispensers are equipped with a micropump and valve system that are sensitive to viscosity, chemical composition and even liquid temperature. The manufacturer indicates in the instructions that the device is only compatible with water-based liquid soap, but this is only the tip of the iceberg. In practice, even among these tools there are those that thicken at low temperatures (for example, in the bathroom in winter) or form precipitation when in contact with air.
The main risks of using inappropriate soap:
- 🔧 Pump breakdown: thick gels (for example, Dove in classic packaging) create an excess load on the engine, reducing its life by 2-3 times.
- 🧪 Corrosion of parts: products with a high alcohol content (>10%) or sodium chloride is corroded by plastic and rubber seals.
- 🚫 Nozzle clog: Soap with particles (scrabs, peels) or insoluble additives (such as Safeguard with antibacterial granules) blocks the sprayer.
- 💧 Leakage: Low viscosity liquids (such as diluted soap) flow through the valves, leaving puddles under the device.
⚠️ Note: If the soap contains triclosan, parabens or SLES (Sodium lauryl sulfate, which can react with the plastic in the tank, causing clouding or cracking, is especially true for Viomi models. S2 transparent-tank.
The manufacturer in official recommendations indicates that the optimal viscosity of the liquid is 100-500 mPa·s (at 25 mPa·s).°C. For comparison, water is viscosity ~1 mPa·s, and the shower gel Nivea - about 10 000 mPa·s. Exceeding this range leads to overheating of the engine and error E2 On the display (if you have it in your model).
Top.-5 Soaps compatible with Xiaomi dispensers
We tested 12 popular products and selected those that do not cause malfunctions in Mijia and Viomi devices, including viscosity, lack of abrasives, neutral pH (5.5-7) and stability during storage.
| Brand and model | Type | Viscosity (mPa·s) | pH | Notes |
|---|---|---|---|---|
| Simple Human Sensor Pump Soap | Antibacterial. | 300 | 6.2 | Xiaomi approved for sensor models. |
| Ecover Zero Hand Wash | Eco-soap | 250 | 5.8 | No SLES And parabens, suitable for allergies. |
| Viomi Original Liquid Soap | Universal. | 400 | 6.5 | Official partner of Xiaomi. S1/S2. |
| Dr. Bronner's Castile Soap (Dilute) | Natural. | 150–200 | 8.0 | Dilute it with 1:1 water. Not for sensitive skin. |
| Pigeon Baby Liquid Soap | Childish | 280 | 5.5 | Hypoallergenic, suitable for kitchen dispensers. |
If you do not find your soap in the table, check its parameters:
- Viscosity: should be in the range of 100-500 mPa·s. You can check visually: soap should flow easily out of the bottle when rolled over, but not spread like water.
- pH: optimally 5.5–7. Acid (pH) < 5) or alkaline (pH) > 8) corrodes.
- Composition: Avoid SLES, triclosan, microplastics and abrasives.
⚠️ Warning: Soap with essential oils (such as L'Occitane) can leave a sticky coating on the inside of the tank. E1 (level sensor blockage in Viomi models S2 Pro.
☑️ Checking the soap before refilling
What happens if you pour the wrong soap?
The use of incompatible liquids is the main reason for warranty failures at Xiaomi dispensers, and according to service centers, 65% of breakdowns are due to the wrong soap.
- 🔥 Overheating of the engine: thick gels (viscosity) >1000 mPa·s) causes the pump to run at the power limit, and after 2-3 months, this leads to a winding break or the control chip to burn.
- 💦 Leaks: low viscosity liquids (<100 mPa·s) flow through the valve even when the dispenser is off, resulting in short circuits (especially in models with a lower power connection).
- 🧴 Nozzle clog: particle soap (like Palmolive with exfoliating pellets) clogs the sprayer. Cleaning is only possible with complete disassembly.
- 🧪 Chemical corrosion: chlorhexidine or hydrogen peroxide products oxidize the metal contacts of sensors, causing an error E3.
The most dangerous option is homemade mixtures (such as diluted hard soap), which often contain undissolved particles that settle at the bottom of the tank and block the intake valve, which are classified as “non-warranty” in service centers, even if the device is less than a year old.
What if the dispenser has already broken because of soap?
Step-by-step instructions: how to properly fill the dispenser
Even if you choose the right soap, the wrong filling can lead to problems.
- Disconnect the dispenser from the network (if the model is powered from the socket). S1) just take out the batteries.
- Remove the top lid of the tank. In some models (for example, Mijia Smart Dispenser 2), you need to press the latch on the side.
- Wash the tank with warm water (if you are refueling for the first time or changing the type of soap). Use distilled water to avoid limestone plaque.
- Pour the soap to the mark MAX (Do not overflow - this can cause overflow when heated.
- Remove air bubbles: slightly tilt the dispenser in different directions so that the liquid is evenly distributed.
- Close the lid before you click. Make sure the sealing ring doesn't skew.
- Connect the power and run the test mode (if any). S2 You need to hold the Mode button for 3 seconds.
After refueling, check the dispenser:
- 🔄 Press the lever (or hold your hand to the sensor) 5-6 times in a row. The soap should come out in a uniform stream, without jerking.
- 👂 Listen to the sound of the pump: it should be smooth, without creaking or clicking.
- 💡 If the display is on fire E0, Soap is too thick – dilute it with water (1:1).
💡
If the dispenser is used in the kitchen, fill it with antibacterial soap (like Dawn or Fairy in liquid form) but avoid dishwashers - they contain aggressive surfactants.
Frequent User Mistakes and How to Avoid Them
Even experienced Xiaomi dispensers sometimes make mistakes that shorten the life of the device.
- Using a shower gel instead of a liquid soap, and the gels have a viscosity of 5,000 to 10,000 mPa·s and will quickly disable the pump, so you can only buy liquid soap or foam soap.
- Diluting the soap with tap water, and the chlorine and salts in the water form a sludge that clogs the valves, so the solution is, use distilled water or boiled water.
- Keeping the dispenser cold, lower temperature +10°C the soap thickens and the pump can't pump it. Solution: Set the device away from windows and air conditioners.
- Ignoring errors on the display. E1 (blockage E2 (overloading the engine requires immediate action. Solution: wash the system according to the instructions above.
- Soap and bleach filling. Chlorine-containing products like Domestos corrode plastic. Solution: use only neutral detergents.
Another common problem is the appearance of mold in the tank.
- 🌿 Soap contains organic additives (aloe, honey, oatmeal).
- 💧 The meter is rarely used (liquid stagnates).
- ☀️ The device is under direct sunlight (accelerates the reproduction of bacteria).
⚠️ Warning: If mold appears in the tank, it is not enough to simply rinse it with water. Use vinegar solution (1:1 with water) or specialized disinfectants (Cillit Bang in spray!
💡
If the dispenser is used less than 1 time a week, fill it with soap with preservatives (for example, Simple Human or Ecover).
Comparison of dispensers Xiaomi with analogues: what is better for soap
If you haven’t bought a dispenser yet or are thinking about replacing it, compare Xiaomi with popular counterparts on key parameters that affect the choice of soap:
| Model | Max. viscosity of soap (mPa·s) | Composition sensitivity | Ease of cleaning | Price (₽) |
|---|---|---|---|---|
| Xiaomi Mijia Smart Dispenser 2 | 500 | Medium (does not like alcohol and abrasives) | Difficult (to be disassembled) | 2 500 |
| Viomi S2 Pro | 600 | Low (most soaps are suitable) | Simple (removable tank) | 3 200 |
| Redmond SkyDispenser | 800 | High (sensitive to pH) | Medium (needs a key to disassemble) | 3 500 |
| Rubetex RD-100 | 1000 | Low (works even with thick gels) | Simple (complete disassembly) | 1 800 |
| SimpleHuman Sensor Pump | 400 | Very high (certified funds only) | Very complex (service cleaning) | 5 000 |
You can see from the table that Xiaomi is in the middle of the price-compatibility ratio. Viomi models are more versatile, but they cost more. If you want a device that is "all soap", pay attention to Rubetex. RD-100 — He even has a slew of sleeves for the shower).
However, cheap analogues have disadvantages:
- 🔌 Rubetex and Redmond often break down due to poor-quality pumps ~1 year vs 3-5 years Xiaomi).
- 📶 Some models (such as Redmond SkyDispenser) have a weak Wi-Fi module, which causes them to lose communication with the application.
- 🛠️ Xiaomi’s service support is better: spare parts are available, and the warranty is 2 years (Rubetex has only 6 months).