Xiaomi’s humidifiers are some of the most popular devices in the brand’s smart home line, but their durability is directly dependent on the quality of the water used. The manufacturer’s instructions usually state that you need to pour “clean water,” but what exactly is hidden under this definition? Can you use tap water if it passed through the filter? How about bottled or distilled? In this article, we will understand what water is best to pour into the Xiaomi humidifier to avoid plaque, breakdown and harm to health.
The problem of choosing water for a humidifier is relevant not only for owners of budget models like Xiaomi Mi Smart Antibacterial Humidifier, but also for premium devices such as Xiaomi Smartmi Air Humidifier 2. The fact is that hard water with a high content of calcium and magnesium salts leads to the formation of lime plaque on the ultrasonic membrane, which reduces the life of the device. Moreover, some models (for example, with the aromatization function) can be clogged with sediments even faster. Next, we will analyze all the water options, their pros and cons, and give specific recommendations for Xiaomi.
Why can’t you pour ordinary tap water?
The main reason is stiffness: Tap water in most regions of Russia and the CIS contains an excess of mineral salts, which, when evaporated, settle on the inner surfaces of the humidifier, which leads to:
- 🔹 The formation of white plaque on the ultrasonic membrane and the walls of the tank, which reduces the efficiency of the work.
- 🔹 Filter clogging (if any in the model, for example, in Xiaomi Mi Air Humidifier Pro).
- 🔹 Spraying microparticles of salts into the air, which settle on furniture and can cause allergic reactions.
- 🔹 Failure of humidity sensors due to corrosion of contacts.
Tap water also often contains chlorine and other chemicals used for decontamination, and when heated (in models with a warm steam function), they can produce an unpleasant odor. For example, in Xiaomi Viomi Smart Humidifier, when using chlorinated water, users note a specific “pool” scent in the room.
⚠️ Note: If in your region the water has a hardness above 8 mg-eq / l (you can find out on the website of the local water utility), it is strictly not recommended to pour it into the Xiaomi humidifier - this will lead to the failure of the ultrasonic generator in 2-3 months.
Distilled water: pros and cons
Distilled water is the gold standard for air humidifiers, completely free of impurities, salts and microorganisms, which prevents plaque and breakdown of equipment.
| Advantages | Deficiencies |
|---|---|
| ✅ No plaque or deposit. | ❌ Requires regular purchase (price from 50 rubles / liter) |
| ✅ Does not damage the ultrasonic membrane | ❌ It does not contain useful minerals (although it is not critical for a humidifier) |
| ✅ It is suitable for all Xiaomi models, including Smartmi Evaporative Humidifier 2. | ❌ In some regions, it is difficult to find a sale. |
| ✅ Does not leave divorces on furniture | ❌ With prolonged storage, bacteria can accumulate (you need to check the expiration date) |
Where to buy distilled water for Xiaomi moisturizer:
- 🛒 Auto shops (most often sold for batteries, suitable for a humidifier).
- 💊 Pharmacies (sometimes in the medical consumables department).
- 🌐 Online stores (for example, Ozon, Wildberries, Beru - look for brands "Distilled water GOST" 6709-72»).
- 🏭 Industrial suppliers (if you need a large volume, you can order a canister of 20 liters).
⚠️ Warning: Don't confuse distilled water with deionized water! The latter undergoes additional ion exchange treatment and may contain residual chemicals. Xiaomi's humidifiers are only suitable for classic distillation.
Filtered Water: Is It Right for Xiaomi Humidizers?
If distilled water is not available, filtered water may be an alternative, but not all filters are equally effective.
- 💧 Brita: Removes chlorine and some salts, but the stiffness remains high, suitable for short-term use, but does not solve the problem of plaque.
- 🏠 Stationary reverse osmosis filter: removes up to 99% of impurities, including hardness salts, the best option if you already have one.
- 🔄 Ion exchange filters: reduce stiffness, but can add sodium, which also settles in the humidifier.
- 🧴 Magnetic “magnetic demagnetizers”: do not affect the composition of water, their effectiveness for humidifiers is not proven.
If you use a filter jug, check the hardness of the water after filtration using test strips (sold in pet stores or household departments). The optimal indicator for a Xiaomi humidifier is less than 4 mg-eq / l. For example, in Moscow, after the filter, the stiffness barrier decreases from 7-9 to 3-5 mg-eq / l, which is already acceptable for short-term use.
For models with antibacterial coatings (such as the Xiaomi Mi Smart Antibacterial Humidifier), filtered water is better than tap water, but still inferior to distilled water, because antibacterial silver coatings lose effectiveness over time due to salt deposits.
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If you use filtered water, wash the humidifier tank with vinegar solution once a week (1:1 with water) to remove the incipient plaque.
Bottled Water: Which Type to Choose?
Bottled water comes in many different types, and not all of it is suitable for humidifiers.
| Type of water | Is it suitable for a moisturiser? | Notes |
|---|---|---|
| 💎 Mineral (essentuki, Borjomi) | ❌ No. | It contains a lot of salts, quickly clogs the membrane. |
| 💧 Drinking (bon aqua, clean line) | ⚠️ Conditionally. | The stiffness varies, you need to check the composition on the label. |
| 🧊 Children (agusha, frutonya) | ✅ Yes. | There is a strict control, the rigidity is usually low. |
| 🌊 Artesian | ❌ No. | Often contains iron and manganese, which oxidize and spoil the device. |
The best choice for bottled water is baby water, which is multi-stage purified and has a balanced mineral composition, such as Agusha or Frutonian water, which is suitable for most Xiaomi models, including the Smartmi Air Humidifier ZA1, and the main thing is to avoid water labeled “mineralized” or “mineralized”.
If you're staying on bottled water, look at the pH level. The optimal is 6.5-7.5. Too acidic or alkaline water can damage the plastic parts of the tank. This information is usually listed on the label under "chemical composition."
Can I use boiled water?
Boiling kills bacteria, but it doesn't reduce stiffness. Moreover, when boiled, some of the water evaporates and the salts remain, which increases their concentration. So boiled tap water for a Xiaomi humidifier is even worse than unboiled water, which forms a plaque faster and can cause an ultrasonic generator to overheat.
The only time boiled water is acceptable is if you initially use soft water (hardness less than 3 mg eq/l) and boil it for additional disinfection, but even then, filtration or distillate is preferable.
⚠️ Note: In models with a function of warm steam (for example, Xiaomi Mi Smart Evaporative Humidifier), boiled water can cause increased scale formation on the heating element, which will lead to its breakage in a few months.
What happens if you constantly pour boiled water?
Comparison of water by models of Xiaomi humidifiers
Not all Xiaomi humidifiers are equally sensitive to water quality, and here are some tips for popular models:
| Model | Recommended water | What will happen when using tap water? |
|---|---|---|
| Xiaomi Mi Smart Antibacterial Humidifier | Distilled or child bottled | Rapid formation of plaque on antibacterial coating, loss of its properties |
| Xiaomi Smartmi Air Humidifier 2 | Distilled or water after reverse osmosis | Ultrasonic membrane clogging, E1 error after 6-8 months |
| Xiaomi Viomi Smart Humidifier | Filtered (hardness <5 mg-eq/l) or distilled | Raid on a humidity sensor, incorrect readings |
| Xiaomi Mi Air Humidifier Pro | Only distilled | Fan failure due to deposits on the blades |
For models with hygrostat (automatic humidity regulator), water quality is especially critical. For example, in Xiaomi Smartmi Evaporative Humidifier 2, the humidity sensor can fail if salts settle on it, which will cause the device to work continuously or, conversely, to turn off prematurely.
If you are not sure what water is suitable for your model, check the instructions or specifications on the official Xiaomi website. Pay attention to the item "Water Requirements" - there are usually allowed parameters of hardness and impurity content.
Check the stiffness (optimally < 4 mg-eq/l)
Make sure that the water is not mineralized.
Measure the pH (should be 6.5-7.5)
Check for chlorine (can be smelled)
If necessary, rinse the tank before pouring.-->
What to do if you do not have access to distilled water?
If you can not buy distilled water, you can use alternative methods:
- Soda soften the water. Add 1 tsp of baking soda to 5 liters of water, stir and let it stand for 12 hours. The salts will settle to the bottom, but this method reduces the stiffness by only 30-40%, suitable for emergency cases.
- Freeze. Put water in a plastic bottle and put it in the freezer. When 70 to 80 percent of the volume freezes, drain the unfrozen water, which is where the salts are. Melted ice can be used in a humidifier. It reduces the stiffness by 50 to 60 percent.
- Vinegar cleaning. Add 1 tbsp. 9% vinegar to 1 liter of water, stir and let stand for 1 hour. Then strain through gauze. This method removes some of the salts and disinfects the water, but it can leave a smell.
These methods won't replace distilled water, but will help extend the life of the humidifier if there are no other options.After using self-acting softening methods, be sure to rinse the tank with clean water to remove residues of soda or vinegar.
For models with flavoring (for example, Xiaomi Mi Smart Humidifier with Aroma Diffuser), amateur water purification methods are not suitable - residues (baking soda, vinegar) can react with essential oils and spoil the aroma.
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If you have to use tap water or softened water, reduce the intervals of cleaning the humidifier from 1 time per month to 1 time per week.