How to pour water into the reservoir of the robot vacuum cleaner Xiaomi: step-by-step instructions

Xiaomi’s wet cleaning robots are real home assistants, but their effectiveness depends on properly handling the water tank. Many users face challenges from leaks to pump breakdowns, simply because they don’t know how to pour the water, how much to use, and what liquids are strictly forbidden. This article will look at all the nuances of the process, from water preparation to cleaning the tank after cleaning.

We have analyzed the instructions for popular models - Mi Robot Vacuum-Mop 2 Pro, Dreame D9, Viomi V3 — And we've identified the general rules that work for most devices. You will also learn why you can’t use tap water without filtration 80% of the time (even if the manufacturer doesn’t directly warn you about it) and how to avoid the most common mistake – overflow, which leads to failure of humidity sensors.

If your vacuum cleaner suddenly stopped spraying water or started to leave a swell, the reason may lie in the wrong filling of the tank, then a detailed analysis of the process, taking into account the technical features of different models.

1.What water can be poured into a Xiaomi robot vacuum cleaner

Manufacturers often limit their instructions to "use clean water," but what does that mean in practice? Tap water contains chlorine, hardness salts and microparticles, which eventually form a plaque on the insides of the pump and tubes, which leads to:

• 🔹 Clogging of sprayers - water ceases to flow evenly to the napkin.
• 🔹 Corrosion of metal elements (in models with electronic flow control).
• 🔹 Breakdown of the water level sensor – the device may not “see” the liquid in the tank.

The best options are:

• 💧 Distilled water is the perfect choice, but requires a purchase (cost). ~50 rub/liter).
• 💧 Filtered water through reverse osmosis systems or household filter jugs (e.g., Barrier).
• 💧 Boiled water cooled to room temperature (eliminates chlorine, but not hardness salts).

⚠️ Warning: Do not use water with additives, not even "safe" floor cleaners, which foam inside the system, block sensors and lead to leaks, except for special fluids for robot vacuum cleaners (for example, Xiaomi Mi Floor Cleaning Solution).

The water temperature matters, too. Cold (below) +15°C) may cause condensation within electronic components, and hot (above) +40°C) - deform plastic parts of the tank. Optimal range: +20…+30°C.

2. Step-by-step instructions: how to pour water into the tank

The process seems simple, but there are critical points that affect the operation of the device. Consider the universal algorithm with the example of Mi Robot Vacuum-Mop 2 Pro (for other models, refinements will be in the table below).

1. Remove the tank. Press a button or pull a special ledge (usually marked with a symbol) 💧). In Dreame models, the tank can be fixed with a latch - do not make excessive efforts.
2. Wash the tank. Even if it appears clean, rinse it under running water to remove dust and residues of detergent from the previous cleaning.
3. Fill it to the mark. There's a risk on the tank wall. MAX (Exceeding this level by 10-15 ml leads to a water overflow over the edge when the vacuum cleaner moves.
4. Put a napkin in. It has to lie flat, without folds, otherwise the water will be distributed unevenly. V3) napkin is magnetized.
5. Close the tank lid. Make sure it's latched, otherwise the water may spill out when cleaning starts.
6. Put the tank back in. You'll hear a click. If the tank doesn't lock, check if the napkin is disturbing.

After installing the tank, run the test mode (in the Mi Home app, select Wet Cleaning for 1-2 minutes) and check whether the wipe is evenly moistened. If there are puddles on the floor, water is overflowed, if the napkin is dry, sprayers are clogged.

Remove and flush the tank|

Check the wipe for wear.|

Pour water to the mark. MAX|

Close the lid before you click.|

Ensure there are no leaks after installation-->

3. Features for different Xiaomi models

The design of the tanks varies depending on the series, and the following are the key differences that affect the filling process:

For models with double tanks (e.g. Dreame) W10) It's important to put water and detergent in different compartments. Mixing the liquids inside the tank leads to foam formation, which blocks the pump. W10 The ratio is indicated: 250 ml of water + 10 ml concentrate.

⚠️ Note: In Xiaomi’s self-cleaning robot vacuum cleaners (e.g. Mi Robot Vacuum-Mop 2 Ultra), the water tank is integrated into the docking station, and the filling is automatically from an external source (bottle or tap through an adapter). Manual filling of such a tank can lead to a failure of calibration of sensors.

4.Typical mistakes and how to avoid them

According to service center statistics, 60 percent of wet cleaning failures are due to tank misuse, and here are the most common mistakes and their consequences:

• 🚫 Water overflows, leaks through the vents and corrosive contacts on the control board, in models with a gyroscope (e.g. Viomi). SE) Excess water can cause false alarms of the drop sensor.
• 🚫 Using unfiltered water, and after 3 to 6 months, the tubes will have a lime-like coating that narrows the lumen, with the symptom that the vacuum cleaner spits or doesn't spray the water at all.
• 🚫 Pouring water when power is on. In rare cases, this can cause a short circuit if the liquid gets to the contacts of the tank (relevant for models with metal connectors, such as Dreame). F9).
• 🚫 Storage of water in a tank, if you leave the liquid inside for 2.+ And then, as you go through the day, you start to multiply bacteria, and you get a bad smell and a green coating on the inner walls.

How to avoid problems:

• ✅ Use a measuring glass for precise water dosing (especially important for models with a small tank like the Mi Robot). 1C).
• ✅ After cleaning immediately pour the remaining water and dry the tank in the air for 10-15 minutes.
• ✅ Once a month, wash the tank with acetic solution (1 tbsp. spoon per 200 ml of water) to remove plaque.

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If your vacuum cleaner starts to sneeze (sharp liquid emissions), check the spray tube for a blockage. Often, compressed air purging (for example, a dryer in cold blowing mode) helps.

5. How to Clean a Reservoir: A Step-by-Step Guide

Regular cleaning extends the life of the pump and prevents the appearance of odor. The procedure takes 5-10 minutes and includes the following steps:

1. Empty the tank. Pour out the rest of the water and rinse under the tap.
2. Remove the napkin. Wash it separately by hand (machine washing destroys the microfiber). Use a 3% hydrogen peroxide solution to disinfect.
3. Clean the sprayers. With a cotton swab dipped in alcohol, wipe the holes at the bottom of the tank. In Dreame models, the sprayers are removable, soaked in citric acid for 30 minutes.
4. Dry the parts. Put the tank, napkin and lid on a towel in a ventilated place. Don't use a hair dryer or battery, because high temperatures deform the plastic.

To remove persistent contaminants (for example, mold), specialized chemistry is suitable:

• 🧴 Xiaomi Mi Floor Cleaner – Removes plaque and disinfects.
• 🧴 Kärcher RM 519 – Suitable for all types of plastic.
• 🧴 Citric acid solution (20 g per 1 liter of water) - budget alternative.

⚠️ Note: Do not use abrasives (such as soda powder) or hard brushes – they scratch the inner surface of the tank, which accelerates the formation of plaque.

6.Frequent breakdowns due to incorrect filling

Failure to follow the rules of pouring water can lead to serious malfunctions, and the most common of these and their symptoms are:

If you notice one of these symptoms, the first thing you do is:

1. Check the tank for plaque or foreign objects.
2. Make sure the wipe is installed correctly and does not block the sprayers.
3. Run a test cleaning without a napkin (put the vacuum cleaner on the pallet) – this will see if water is coming in.

In 70% of cases, the problem is solved by cleaning the tank. If not, contact the service. Do not disassemble the vacuum cleaner yourself if it is guaranteed: opening the case will void warranty obligations.

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Monthly cleaning of the tank and using filtered water reduces the risk of breakdowns by 85%, which is cheaper than repairing the pump or replacing the board!

7. Alternative liquids: what can and cannot be poured

In addition to water, some users are experimenting with other fluids to improve cleaning, and consider the options that are both legal and prohibited.

• ✅ Special cleaning products for robot vacuum cleaners (for example, Xiaomi Mi Floor Cleaning Solution) are non-foaming and safe for plastic. Dosage: 5-10 ml per 200 ml of water.
• ❌ Household detergents (Mr. Proper, Glade) cause foaming that blocks the pump.
• ❌ Vinegar or bleach in its pure form, corroded by rubber seals and tubes.
• ✅ Alcohol solution (10% alcohol) + 90% water – only for disinfecting the tank (not for cleaning!).
• ❌ Essential oils. They leave a greasy film on the sensors and a napkin.

If you want to use a detergent, choose products labeled "robot vacuum cleaners" and test it on a small area of flooring. Some coatings (such as laminate) can become cloudy from aggressive compounds.

To flavor the cleaning, you can add 1-2 drops of lavender or tea tree essential oil to the water, but only if:

• The oil is 100% natural (without synthetic additives).
• You use distilled water (the oils do not dissolve in hard water and leave sediment).
• After cleaning, wash the tank with clean water.

FAQ: Answers to Frequent Questions