What water to pour into the robot vacuum cleaner Xiaomi: the right choice

Owning Xiaomi’s smart appliances is not just about enjoying clean floors, but also about being responsible for operating the device properly. One of the most common questions new owners have is the choice of fluid for the tank. The answer seems to be clear – water is water, but the chemical composition of the fluid directly affects the life of the robot’s pumps, nozzles and filtration elements.

The wrong choice of cleaning product can lead to scale formation, clogging of microchannels and even failure of the electronic board of the fluid control. In this article, we will discuss in detail what exactly can and what categorically can not be used in the tanks of robot vacuum cleaners Xiaomi and Roborock.

Understanding the principles of the humidification system will help you avoid costly repairs and maintain a warranty on the device. We will consider the physical properties of various liquids, their effect on the materials of the tank and the effectiveness of removing contaminants from flooring.

Technical features of the water supply system

Xiaomi’s modern robot vacuum cleaners use two basic water delivery technologies: gravity (spoiled) and electronically controlled pumping. In gravity models like the early versions of the Xiaomi Vacuum-Mop, water seeps through tissue under gravity. Here, it is critical that the liquid is not too viscous, otherwise it will simply stop flowing to the floor cloth.

More advanced models, such as the Xiaomi Robot Vacuum X10+ or the Roborock S7 MaxV, feature an electronic pump, a miniature pump that delivers water to a cloth tank or directly to the floor, and in such devices, fluid quality is crucial, as the mechanical parts of the pump are sensitive to abrasive particles and chemically aggressive environments.

In addition, the system often has membrane filters that protect the internal highways. Using inappropriate fluid can cause sealing gums to swell or break, leading to leaks. The robot's electronics that control the water level can also suffer from contact oxidation if a conductive or aggressive mixture enters the tank.

It is important to understand that the system is designed by engineers with a view to certain physical and chemical parameters of the environment, and any deviation from these parameters, whether it is temperature or pH balance, creates additional stress on the components.

Ideal choice: distilled or demineralized water

The gold standard for any water-contacting equipment is distilled or demineralized water, a type of liquid that can be purchased from any car store or household chemical department, the main advantage being that there are no hardness salts (calcium and magnesium) at all.

When you evaporate your tap water, the salts stay on the floor, forming a white coating, and they settle inside the robot tank, and over time, this plaque becomes a solid scale that clogs the nozzles, and there's no impurities in the distilled water, so it evaporates without a trace, keeping the insides of the device clean.

Using purified water is especially important for regions with high tap water hardness. If you live in such an area, buying a distillate canister will be the best investment in the durability of your Xiaomi.

• 💧 The complete absence of stiffness salts prevents the formation of scale on the heating elements (if any) and the pump.
• 🛡️ Extends the life of rubber seals and membranes, as it is chemically neutral.
• ✨ Does not leave divorces and whitish marks on dark glossy surfaces of the floor after drying.
• 🔧 Reduces the risk of microchannel clogging in electronically controlled feed tanks.

It's worth noting that distilled water is a dielectric, which is theoretically safer for electronics in the event of leakage, although you shouldn't rely on it. The main purpose is to protect the mechanical part from mineral deposits.

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Distilled or demineralized water is the only sure choice for long-term operation of a robot vacuum cleaner without the risk of scaling.

Can I use ordinary tap water?

Many users are wondering, what happens if you put tap water in a Xiaomi robot vacuum cleaner? Short-term — nothing will happen. The device will work and cleaning will take place. However, with regular use of such liquid, negative consequences are inevitable.

Tap water contains chlorine, pipe rust and, most importantly, hardness salts. Chlorine can gradually break down plastic parts of a tank, making them brittle. Rust and fine sand clog filters, reducing water delivery efficiency. But the main enemy is lime plaque.

⚠️ Attention: Regular use of hard tap water leads to the fouling of the internal canals of the tank with stone plaque, it is impossible to remove it mechanically, and chemical cleaning with acids can damage other parts of the robot.

If you can't buy distillate all the time, use tap water only after pre-boiling and settling. Boiling reduces hardness (some of the salts precipitate), and settling allows you to remove chlorine and large suspensions. However, even boiled water is not as good as demineralized water.

In emergency cases, when there is no other liquid at hand, you can pour filtered water (through a jug or reverse osmosis system), reverse osmosis filters remove up to 98% of impurities, making such water quite suitable for robot vacuum cleaners.

Specialized detergents for robotic equipment

Xiaomi and Roborock make special cleaning solutions specifically designed for their devices, which are low foaming and safe chemical composition, and the use of ordinary household chemicals (for manual washing) in the robot is strictly prohibited.

Why can't you pour Mr. Proper, Domestos, or ordinary liquid soap? The first is foaming. The robot vacuum cleaner is very much stirring the water in the tank as it moves. The usual tool will beat thick foam that will get into the electronics or disrupt the fluid level sensors. The second reason is aggressive chemistry, which corrodes plastic and rubber.

Specialty products like the Xiaomi Mijia Floor Cleaning Solution have antibacterial properties and smell good, but are completely safe for the internal components, leaving no sticky layer that could attract dust immediately after harvesting.

If you're going to use a special device, it's important to keep the proportions, and it usually takes just one or two caps to fill a tank of water, and if you're going to get too much concentration, it won't make the floors cleaner, but it will increase the risk of divorce.

• 🧪 Low foaming protects electronics and sensors from false positives.
• 🌿 Safe pH balance does not destroy plastic and rubber components.
• 🦠 Antibacterial supplements help to disinfect the floor surface during cleaning.
• 🚫 Lack of sticky components prevents rapid floor contamination after drying.

Categorically prohibited liquids and substances

There are a number of liquids that can cause instant breakage or loss of warranty when they enter the tank of Xiaomi’s robot vacuum cleaner, including any alcohol-containing solutions, acetone, kerosene, gasoline, and chlorine-containing bleach (such as “White”).

Alcohols and solvents aggressively affect plastic, causing it to cloud, crack or dissolve, which can cause the tank to burst during operation, chlorine-containing substances are corrosive and destroy the metal parts of the pump and contacts.

⚠️ Note: Use of any liquids with a temperature above 40°C forbidden! hot water deforms plastic parts of the tank and can damage thermosensitive elements of the robot's electronics.

It is also not recommended to use water with added vinegar or citric acid in high concentrations for regular cleaning. Although acids are good at dissolving scale, their constant use thins rubber pads. Acids can only be used for periodic preventive washing of the system, but not for daily use.

Oil emulsions and floor polishes are also banned, and oil clogs the filter pores and membranes, making them inefficient, and after oil, it's going to be extremely difficult to restore the water supply system to normal, and it's going to take a complete disassembly and replacement of the filter elements.

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If you accidentally poured a prohibited liquid into the robot, immediately start the cleaning cycle of the tank (if there is in the application) or rinse it several times with clean distilled water before using the device again.

Table of comparison of liquid types for robot vacuum cleaner

To illustrate this, we'll compare the basic characteristics of different types of water and solutions so you can make the final choice, and this chart will help you assess the risks and benefits of each option.