Overview: Legionella in the Water

In Germany and many other parts of the world there is no bacteria in the drinking water. Water suppliers are controlled strictly and provide water of high quality. So in general there is nothing to worry about.

Nevertheless there are some cases where bacteria grows in the water. For example boilers which are operated with low temperatures for saving energy are an excellent habitat for microorganisms. If they enter the system once it is difficult to get rid of them. They live in incrustations at the pipe walls, which also can protect them from heat or other harmful factors.

There are several methods to fight legionella. The most common ones are thermal disinfection, UV and chemical treatment. For thermal disinfection the water is brought and held at a very high temperature to kill the bacteria. Sometimes this is done regularly which is expensive and difficult. While the water is heated up no one in the building can take out water due to the risk of burning oneself.

UV treatment works where water flows through the device. Every bacteria in the water is killed. The problem is that huge water systems often have so called dead legs where water is stagnating. These would not be reached by the treatment, bacteria can grow here and spread in the system.

Against legionella without chemicals

Against these microbiological problems we developed a special device. Our Merus Ring Bio is responsible for many good results against legionella and other bacteria. In the first weeks after the installation the amount of microorganisms in the water goes down about 80%. Afterwards this development is slowed down but goes on continuously. Depending on the complexity of the system it can take some months until there are no microorganisms in the pipe anymore. But the solution is sustainable – the success stays stable.

Please note: for this application we always start with a trial phase where the water needs to be monitored by a unbiased laboratory. Working with bacteria and the human health is a sensitive issue, therefore we need to ensure the success of the method in every individual case.

Two effects of the Merus technology are needed to achieve good results. First of all the special Bio Rings emit an oscillation which reduce bacteria growth directly. Additionally incrustations and deposits in the pipe are removed and thus the habitat of the microorganisms destroyed.

The effect is transported with the direction of flow. Therefore also dead legs are reached which is a big advantage of the method.

What is important is that we always offer the solution, not the device. This means we guarantee contractually that in a documented time the amount of microorganisms in the water is below the required values. In most buildings this is less than 100 cfu/ml at a temperature of 22°C. As no bacteria is killed but their habitat is taken there is no sudden result expected but success in the long run.

To achieve the results described above our special Merus Ring Bio is needed. The standard rings have only minor effect on bacteria in the water.

We are not able to kill bacteria in the water and regain water quality right after the installation. To achieve this filters or similar methods are needed.