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How do I maintain my reverse osmosis system?

24 Jun 2025

Reverse osmosis systems are a popular choice for household water treatment. They offer a very effective solution for removing impurities and improving water quality. As with any technical equipment, regular maintenance and care are crucial for the performance and longevity of your system. Here are some important points to consider when maintaining household reverse osmosis systems.

1. Regular Use: The Key to Maintaining Your System

It may seem paradoxical at first, but one of the best measures for maintaining your reverse osmosis system is regular use. Constant water flow continuously flushes all filters and membranes, which helps to minimize the risk of contamination and prevent anything from getting stuck in the membranes.

Many modern systems are equipped with so-called "holiday kits." These simulate regular use even when the system is not in operation for an extended period – for example, while you are on vacation. This is particularly important because prolonged inactivity of the system can lead to contamination.

2. Filter and Membrane Replacement: An Investment in Your System's Longevity

The pre-filters in a reverse osmosis system play a crucial role by protecting the membrane from damage due to sediment and, above all, limescale. Although these filters may not have a major impact on water quality in the short term, they are of crucial importance for the longevity of the system.

It is recommended to change these filters every 6 to 12 months – depending on the quality of the incoming water and your water consumption. For 95% of our customers, changing them once a year is sufficient. The membrane itself should be changed approximately every 3 to 7 years. With every annual filter change, we check the condition of the membrane. In our experience, there are systems where the membranes still function well after 7 years, while in others they need to be replaced after only 2 to 3 years. This depends heavily on the use of the system and the quality of the regional water and, above all, the quality of the membranes.

Through regular maintenance and timely replacement of filters and membranes, you can ensure that your reverse osmosis system operates efficiently and effectively for many years.

3. Monitoring Water Quality

Monitoring water quality is a central part of reverse osmosis system maintenance. An important indicator for this is the level of Total Dissolved Solids (TDS). An increased TDS value can indicate that the membrane needs to be replaced.

Many reverse osmosis systems are equipped with an integrated TDS meter, which allows for simple and straightforward monitoring. If a certain value is exceeded, the system can trigger an alarm – for example, by an audible signal or a warning message on the display.

For systems that do not have an internal measuring device, changes in water quality are often noticed by a change in taste or by the appearance of limescale deposits in the kettle. If you notice such changes, it is advisable to check your system and especially the membrane.

If you need support with this, please do not hesitate to contact us. We will be happy to assist you with monitoring your water quality and maintaining your reverse osmosis system.

4. Overhaul every 3 to 5 years

Preventive maintenance is crucial for the lifespan of your reverse osmosis system. Similar to a car that needs regular inspections, your system should undergo a comprehensive service every three to five years. During this check, all parts – including membranes, check valves, hoses, and valves – are inspected and replaced if necessary. This thorough maintenance not only extends the life of your system but can also prevent potential water damage. If you are already a customer of ours, we will remind you in good time and carry out the overhaul.

5. Professional Maintenance

While many aspects of reverse osmosis system maintenance can be performed by yourself, it is often advisable to consult a professional regularly. A professional can thoroughly inspect the system, diagnose any problems, and ensure that your system is functioning optimally.

6. Avoiding Contamination:

Tank Systems vs. Direct Flow Systems

Although there is always a certain risk of contamination, you should not worry unnecessarily. It is important to know that regular use and maintenance are the best defense against contamination. Additional modules such as germ barriers or UVC LEDs can be helpful, but are not always necessary if you follow some basic care instructions.

Tank Systems

Tank systems store purified water for later use. However, this can lead to contamination as bacteria can accumulate in the tank over time – especially if the system is not used for extended periods. To prevent contamination, you should regularly disinfect the storage tank, for example, by adding a disinfectant and performing a flush cycle. For prolonged non-use, you should thoroughly flush and disinfect the system before re-use. If you own a tank system and replace the filter yourself, you will always receive a small disinfection module for the tank. Please be sure to use it according to the manufacturer's instructions.

Direct Flow Systems

Direct Flow systems – also known as tankless systems – produce purified water on demand. They do not require a large storage volume and are therefore often more compact. They eliminate the risk of contamination that exists with tank systems, as there is no standing water in which bacteria can accumulate. Nevertheless, maintenance is also important for these systems to keep all components hygienic and ensure water quality.

Conclusion

Maintaining reverse osmosis systems is crucial to ensure their performance and longevity. The choice between a tank system and a direct flow system depends on various factors – including space availability, water consumption, and willingness to invest. Both types of systems can effectively remove impurities from water, but require different care and maintenance strategies.

Signs of potential contamination can be:

  • Change in taste or odor of the water
  • Change in water color
  • Reduced water pressure
  • Increased TDS value
  • Visible algae or mold growth

If you notice such signs, you should check and clean your system or consult a professional.

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