Xiaomi's automatic foam soapboxes have gained popularity for their convenience and cost-effectiveness. However, many users have difficulty using replacement units for the first time — they don't know how to properly dilute concentrate, what proportions to follow, and how to avoid typical mistakes. In this article, we'll go through everything from the composition of the original blocks to alternative recipes for different skin types.
It is no secret that the quality of the solution depends not only on the foaming, but also on the life of the device itself. Using inappropriate water (for example, hard or boiled) can lead to clogging of the sprayer after 2-3 weeks of operation, so it is so important to follow proven recommendations.
What is a replacement unit for Xiaomi soap and why to breed it
A removable unit (or cartridge) is a sealed container with concentrated detergent that is installed inside an automatic soap box, and unlike finished gels or liquid soaps, the concentrate requires a pre-dilution with water, and this is done for several reasons:
✅ Efficiency - one block is enough for 300-500 ml of finished solution (depending on the model), which is 2-3 times longer than that of a conventional liquid soap.
✅ Green – less plastic waste (you only buy a small cartridge, not bottle by bottle).
✅ Consistency control – you can adjust foam density to your preferences.
Not all units are the same, however. For example, Xiaomi Mijia and Viomi soapboxes use different concentrate formulas: the former contain more moisturizing components (suitable for sensitive skin), and the latter contain a reinforced antibacterial formula, which is important to consider when choosing dilution proportions.
The official composition of the Xiaomi replacement blocks: what is inside
The manufacturer does not disclose the full chemical composition, but the documentation for soap boxes lists the key components, and the table below compares the two most popular lines:
| Component | Xiaomi Mijia (standard) | Xiaomi Viomi (antibacterial) |
|---|---|---|
| Basic surfactant (surface active substance) | Cocamidopropylbetaine (soft) | Sodium laureth sulfate + cocamidopropylbetaine |
| Humidifiers | Glycerol, panthenol | Aloe vera, allantoin |
| Conservatives | Sodium benzoate | Sodium benzoate + phenoxyethanol |
| pH | 5.5 (neutral) | 6.0-6.5 (low-acid) |
Important: it is free of parabens and SLS (aggressive sulfate), making it safe for frequent use, but if you are allergic to cocamidopropylbetaine (rare but rare), it is best to test the soap on a small area of skin before full use.
Interesting fact: in the units for Xiaomi Viomi Smart Soap Dispenser added silver ion in microdoses (0.003%), which enhances the antibacterial effect. But this does not mean that the solution can be used as a disinfectant — its main function is still hygienic, not medical.
Dilution Proportions: How Much Water to Add
The standard instruction from Xiaomi recommends diluting the concentrate in a ratio of 1:3 (1 part block to 3 parts water).
- 💧 Water hardness – in regions with hard water foam is worse, so you can reduce the amount of water to 1:2.5.
- 🧴 Type of skin - for dry skin it is better to make the solution less concentrated (1:4), for oily - more thick (1:2).
- 🌡️ Water temperature – warm water (30–40)°C) better dissolves concentrate, but do not use boiling water!
If you use distilled water, you can't adjust the proportion, but experiment with tap water, and sometimes even within a city, the stiffness varies by district.
Check out the model of the soap box (Mijia/Viomi/Other)
Prepare a measuring glass or syringe for precise proportions
Use room temperature water (20–25°C)
Do not shake the block before opening (excess pressure can be created)
Wash the soap container before first use-->
Step-by-step: how to dilute the block without errors
The process seems simple, but many people manage to ruin the block in the first step.
- Open the replacement unit. Carefully cut the top along the cut line (usually marked with a dotted line). Don't use scissors - it's better to take a stationery knife so as not to deform the neck.
- Pour the concentrate into a container. In the soapboxes, Xiaomi comes a measuring cup. If you don't have one, use a 50-100-ml syringe for accuracy. The standard unit contains ~50 ml of concentrate.
- Add water. Pour the water in a thin stream, stirring constantly. If you pour the water right away, it can form lumps.
- Stir. Cover the container with the lid and gently flip it 3-4 times. Don't shake it, it will cause excessive foaming inside!
- Leave the solution for 10-15 minutes, and during that time, the air bubbles will disappear, and the consistency will become uniform.
A critical error: many users try to dilute the concentrate directly in the replacement unit by adding water through the neck, which leads to the undissolved particles clog the soap sprayer. Always dilute the solution in a separate container, and then pour into the device!
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If the solution is too liquid after dilution, add 5-10 ml of concentrate and mix. If too thick, add warm water (not boiling water!) and leave for 30 minutes.
What water to use: myths and reality
Not only does the consistency of the foam depend on the quality of the water, but the life of the soap box as well.
- 💦 Tap water. You can use it, but only if it's soft (hardness up to 3 mg-eq/l). Check the scale in the kettle - if there's a lot of it, the water is hard.
- 🔹 Boiled water. Boiling kills bacteria, but it doesn't reduce hardness. In fact, when boiled, chlorine evaporates, but the calcium and magnesium salts remain.
- 💧 Filtered water, best if you have a good filter (like reverse osmosis) removes both chlorine and hardness salts.
- 🧪 Distilled water. Perfect for breeding, but it's not really practical to buy it, and it's filtered.
⚠️ Attention: if you use tap water, once a month, wash the soap sprayer with a weak acetic solution (1 tbsp. vinegar per 100 ml of water) This will prevent the formation of lime plaque.
An interesting experiment was that users from the Mi Community forum tested different types of water and found that when distilled water was used, the foam lasted 20% longer and the solution consumption decreased by 15%, but the difference is noticeable only with prolonged use.
Alternative recipes: can you dilute the block not according to the instructions
The official proportions are not dogma, and many users adapt the solution to their needs, and here are some proven options:
| Purpose | Proportion (concentrate:water) | Additional ingredients |
|---|---|---|
| For baby skin. | 1:5 | 1 tsp jojojoba oil (softens) |
| For oily skin. | 1:2 | 2 drops of tea tree essential oil |
| To save money | 1:4 | — |
| For antibacterial effects | 1:3 | 1 tsp hydrogen peroxide (3%) |
⚠️ Note: when adding essential oils or other components, make sure they are compatible with surfactants in the unit. For example, do not mix the concentrate with alcohol or citric acid - this can cause a chemical reaction and spoil the solution.
If you want to completely replace the original unit with a homemade solution, use a base of liquid Castilian soap (20%) + water (70%) + glycerol (10%). However, note that such soap can foam worse in Xiaomi automatic dispensers due to a different viscosity.
What happens if you overdo it with concentrate?
Typical Problems and How to Avoid Them
Even if you follow the instructions, users face difficulties.
- 🚫 The reason is that it's too hard water, too much water, too much water, clogged spray, so you can wash the device and try diluting a new solution with distilled water.
- 💦 The solution is too liquid, too much water, or too little concentrate (possibly fake) Solution: add 5-10 ml of the original unit and mix it.
- 🧼 Soap bowls spit out solution, causes: excessive foaming inside the tank, solution: reduce the amount of concentrate next dilution.
- 🔋 The device doesn't recognize the replacement unit, because the lid is not tightly closed, the unit is not original, or the level sensor is triggered (if the container is full). Solution: check the tightness and amount of solution.
If the soap box stopped working after the unit was replaced, try resetting: press the foam feed button for 10 seconds, which in 80% of cases helps to restore performance.
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Use only original replacement units or certified counterparts. Cheap fakes often contain aggressive surfactants that spoil the soapbox mechanism and cause skin irritation.