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Why is there a "wastewater area" in the outer tank, and why is it not separated all the way to the top?

Every reverse osmosis process produces two water streams: filtered water and a more concentrated residual water (wastewater). This residual water contains the substances retained from the raw water during filtration. To prevent these substances from permanently remaining in the system or the cartridges themselves, they must be flushed out with the wastewater and directed back into the outer tank.

In our system, a portion of the residual water is deliberately reused to significantly reduce water waste. That's why the partition in the outer tank doesn't extend all the way to the top. This allows the system to operate with higher efficiency by refiltering parts of the residual water, achieving a pure-to-wastewater ratio of approx. 2.3:1 (approx. 3.5 L filtered water to approx. 1.5 L wastewater). Many other devices are closer to about 1:1.

What technically happens in the tank?

The system essentially treats the water in the outer tank as raw water during filtration. During the process, the concentration of the filtered-out substances in the remaining residual water increases because

• the substances "remain" in the tank or enter the residual water area, and
• the amount of water in the outer tank simultaneously decreases.

When this concentration reaches a point where further filtration would be inefficient, the remaining residue (typically approx. 1.5 L) is discarded as wastewater. This keeps the performance and lifespan of the filters stable.

Does this mix with the "good" water?

There is an intentional mixing in the outer tank because the partition does not reach all the way to the top. This is uncritical because

• this water in the outer tank is never directly dispensed as drinking water, but always runs through the filter stages again, and
• the system is designed to work reliably even with fluctuating input values in the tank.

Why is this not a problem for the filters?

The filter stages are designed precisely for this operating principle. Controlled handling of more concentrated residual water is normal and important in osmosis systems to prevent the filters from clogging unnecessarily quickly and to maintain consistent filter performance.

Advantage for you

You get a clean result with significantly reduced water waste. In short: less wastewater, stable filter performance, and in the end, everything that is dispensed is completely filtered anyway.

Both post-filters mainly alter the taste – but in different ways. The green MN filter is another activated carbon filter and is made from coconut fibers. It changes the taste in a more "neutral" way. The blue mineral filter enriches the water with minerals (including calcium, magnesium, potassium, sodium), which often makes the water taste "rounder."

Overview of values in mg per liter with the mineral filter:

- Calcium: approx. 21.8

- Magnesium: approx. 2.1

- Sodium: approx. 0.8

- Potassium: approx. 1.8

The quantities released are below those of classic mineral waters, but are based on a natural, mild mineral profile. This makes the filter particularly suitable for daily use, making it ideal for anyone who wants to drink pure, yet balanced mineralized water.

The mineral filter increases the pH value of the filtered water to a level of 7 – 7.5.

The HO3 Home One is a water treatment system that removes impurities from water through reverse osmosis. It does not require a fixed water connection and can be used flexibly.

The device has a 5L raw water tank. The tank can be easily removed for filling. The raw water tank has a separate compartment for dirty water.

The pure water to wastewater ratio for the Home One is 2.3:1. This means that from 5 liters of raw water, you get 3.5 liters of filtered water and 1.5 liters of wastewater.

The device has a 1.5-liter internal tank where filtered water is stored. As soon as water is drawn, the device automatically starts the filtering process, ensuring that 1.5 liters are always available.

The device takes approximately 4–4.5 minutes to filter 1.5 liters of water.

This depends on the respective filter, actual use, and the quality of the tap water. Reference values for 5 liters per day are:

CF and MN filters: 12 months

RO filters: 16 months

Yes, the system is ideal for use in RVs, boats, or other places without a fixed water connection.

In addition to regular filter changes, occasional cleaning of the device is recommended to ensure optimal performance.

Furthermore, regular descaling of the device is required depending on your water hardness. To do this, enter your postcode online and search for "water hardness" to get an overview of the lime content in your region.

You can find more information about descaling here: HO3 Home One Cleaning Set

A kettle reaches an effective temperature of 93°C. The flow heater of the Home One reaches the same temperature. On the way from the flow heater to the glass, the water effectively cools down to ~87°C. A difference is not noticeable.

This can be calibrated very easily on the display. Connect the device to the power supply, press and hold the volume button for 5 seconds during startup, and select an output volume between -20% and +20%. The device is calibrated.

HO3 offers a 30-day money-back guarantee. This means you can test your Home One for a month without obligation. If you find within this period that the Home One is not right for you, you will receive a full refund of the purchase price upon return of the product. An email to the Customer Happiness Team is all it takes.