Swimming pool water treatment

indoor swimming poolUnfortunately a (private) swimming pool offers not only holiday feelings, but also a lot of work. How big the maintenance effort will be, to keep the pool clean, depends a lot on the water quality itself.

Swimming pool water, clean and healthy

Clean and healthy pool water, should be the ultimate goal of any pool water treatment. The most common solution to achieve this, is a chemical water treatment of the pool.

Chlorine is the first choice for maintaining healthy swimming pool water. Chlorine has been used for years in swimming pools all over the world. Chlorine is a highly reactive chemical and reacts with all kinds of biological impurities in water. Impurities that come from outside, such as dropping birds or from the swimmers themselves. If these organic impurities are not treated proberly, there might to develop bacteria, algae or biofilm. To kill these organic impurities the chlorine is added. Depending on the pH level of the pool water, more or less chlorine should be added. If the pH is above 8 the ability of the chlorine to desinfect the pool water declines. it is recommended to have a pool water with a pH level in between 7.2 and 7.4. For a swimming pool it is recommended to have a chlorine content in bwetween 0.5 and 1 ppm. In a special warm swimming pools or a Jacuzzi the chlorine should be in between 1 and 2 ppm.
To get the water chemistry right, this sound not only complicated, this is complicated to achieve the right mixture of chlorine and ph level.
This mighht be one reason why the pool maintenance is often so costly.

The disadvantage of chlorine is that it makes no difference between organic impurities and the human body. The consequence after a long stay in the water are red eyes, caused by chlorine. Thats the reason why most people wear swimming goggles.
People are very much used to the smell of chlorine in a public pool. If this chlorine smell is missing, they feel unsafe. This happened during the 2004 Olympic Games in Athens, Greece. There was an alternative treatment methode used. This treat is total save and delivering the same testing results, as the chlorine treatment. Proven by checking the redox value,the pH value, TOC or BOD. But despite all these data, the athlets still felt unsure, if it is safe to swim or not.

In case the pool water has to much calcium hardness or other debris, this might lead to technical problems. Like fouling or incrustations in pipes and the pool itself. Accordingly the pool maintenance and cleaning will increase. If the feeding water is very hard, huge amounts of limescale might settle at the walls of the pool. As seen at the photos enclosed. Even if there is only a little calcium carbonate in the water, crusts will form at the evaporation line of the water. These deposits at the edge of the pool are often difficult to remove and involve manual work.

Swimming pool maintenance, less effort, less cost

Compared to the maintenance effort described above, Merus solutions sound incredibly simple.

The principle setup of a swimming pool is always the same. You have the pool, there the water is pumped around in a pipeline. There is a filter system, a pump and maybe a heating element, thats it.

Depending on the size of the swimming pool, Merus install one ring at the feed line of the fresh water and another ring in the circulation line. In case of a big public pool, we have to install in the circulation line of each pool, to achieve the same results in all pools.

What happens?

After Merus soft texture of the scale at the wallIn case of calcium hardness, Merus keeps the calcium solved in the pool water, or the scale have a softer texture. With the result the pool water feels far softer, despite the calcium. Less crust forming at the evaporation line. And thes crust are far easier to remove. When we are using the Merus Bio Rings we also fight the growth of algae in the pool.

We have private customers, who are using their swimming pool only for themselves. Several of customers dont use any chemicals since the installation of the Merus Rings, anymore. No chlorine or other pool chemicals. Without having problems with the quality of the water.

We wouldn’t recommend such a thing for a public pool. If countless visitors use this swimming pool, the risk would be too great. I’m sure the regulatory authorities wouldn’t agree.

But, we have public swimming pools as customers. These customers use Merus rings to reduce their maintenance costs. For the protection of pipes or heat exchangers.
These customers also report that they need significantly less chlorine to disinfect the water than before while maintaining the same water quality.
There are data and references to these results available. And of course we offer trails or demonstrations for public pools.


We use cookies to ensure that we give you the best experience on our website and to improve the relevance of our communications with you. If you continue without changing your settings, we’ll assume that you are happy to receive all cookies on the merusonline website. However, if you would like to, you can change your cookie settings or find detailed information about how cookies are used on this website by going to 'Data protection'.