F.A.Q.

There is a strong scent of chlorine around the pool, is there too much chlorine in it?

This in one of the biggest misunderstandings! When you smell chlorine, the concentration of chlorine is not too high, but too low!

At low chlorine concentrations chloramines develop (combined chlorine), these chloramines cause the typical chlorine smell. By dosing an extra quantity of chlorine (super chlorinating), this problem will be solved. The combined chlorine is turned into free chlorine as a result of this treatment. The strong scent of chlorine will disappear.

The pH-value of my pool is not stable, what is the cause of that?

The total alkalinity is too low. Increase the level with melpool TA+ to between 100 - 150 ppm. You will find more information on page alkalinity.

Important: pH corrections need to be done in small steps. Increase of decrease the pH value in steps of max. 0.4 each time. Afterwards you wait at least 8 hours, before taking the next step.

What are algae?

Green algae - these are usually floating algae, they sometimes stick to the sides. The pool water gets a green glow and becomes cloudy. The pool no longer looksattractive, the bottom might even become invisible. Before the green colour appears, the sides of the pool usually get slippery. Algae first occur where the water circulation is lowest, for example in corners of the pool or on the bottom of the sides. Yellow algae - these appear as a yellow powder substance, usually in the part of the pool, which lies in the shade most. Yellow algae are resistant to chlorine, even with a free chlorine value of 3 - 5 ppm.

Black (blue/green) algae - these form persistent stains on the bottom and sides of the pool. The structure of these algae is layered, the top layer can be killed by chlorine. This top layer protects the layers underneath against destruction, though. These algae are also resistant to chlorine.

I am bothered by red irritating eyes, what is the cause?

Irritated red eyes and sometimes a dry and irritated skin as a result of swimming sometimes occur.
This is not caused by too much chlorine in the water. Most common causes of these appearances are:

PH value of the water too low or too high Amount of chloramines (combined chlorine) too high Chloramines are a combination of nitrogen and chlorine. The chlorine is very welcome in the swimming water, but the nitrogen is not. The nitrogen in the water is caused by sweat, spittle, urine and some algaecides.

Chloramines irritate the eyes, skin and other parts of the body. (See trouble shooter).
Especially a low pH value in combination with chloramines causes problems!

Why is the water of my pool green?

Green grass is nice, however most people are not attracted by green water. Green water can have various causes. If the water is green and cloudy, this is caused by the presence of algae. The green colouring usually occurs first in corners of the pool, because the water circulation there is less.
See trouble shooter for instructions how to kill algae.

If you use stabilised chlorine products, like melpool 63/G or melpool 90/200, you may measure enough chlorine, but may still be bothered by algae growth. In that case the stabiliser value (cyanuric acid) probably is too high.

Why does the hardness of water differ per region?

The answer to this question concerns the composition of the soil. Waterhardness reduces as there is more sand in the ground. Rainwater is, by nature, very soft. But before drinking water is made, rainwater has to go a long way: as river water or as rainwater. In both cases the water picks up various substances from the ground, among others calcium and magnesium.
Click here for more information about the hardness of water!