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Algae on my pool

L’apparition d’algues dans l’eau est le principal problème que tous les propriétaires de piscine veulent éviter. Elles apparaissent dans différentes situations : avec la chaleur estivale, pendant la période d’hivernage ou en cas d’augmentation importante du TDS (Total des solides Dissous). Dans cet article, retrouvez tous nos conseils pour lutter efficacement contre les algues et pour agir dès que l’eau se trouble.

Algae may appear in the pool water.The water becomes cloudy.

Why do algae grow?

During the wintering period: Algae growth during this period is common, especially if you have practised passive overwintering (total cessation of filtration and treatments) or light filtration during active overwintering.

Une remise en route tardive : As soon as the water temperature reaches 12°, do not delay in de-wintering your pool, even if you will not be able to enjoy your pool for several weeks. The lack of adequate treatment, combined with a rise in temperature and humidity, will inevitably lead to algae. 

Inappropriate chemical treatment: : lorsqu’une eau de baignade n’est pas suffisamment ou correctement traitée, le pH de l’eau se déséquilibre et le désinfectant n’agit plus assez. En suivant les recommandations d’ICO, vous bénéficiez d’une analyse continue de la qualité de l’eau de votre piscine et de recommandations personnalisées (adaptées aux produits que vous utilisez habituellement) avec des dosages précis. 

Pendant l’été : avec les grosses chaleurs, une température de l’eau trop élevée favorise le développement d’algues.

Too high a TDS (Total Dissolved Solids): it can also cause algae growth. It is necessary to measure the TDS level quickly. Find here our video on TDS.

The different algae on your pool water

  • Green algae: : ce sont les plus fréquentes. L’eau de la piscine devient verte et des tâches peuvent apparaître sur le fond et les parois de votre piscine qui seront alors glissants et gluants au toucher.
  • Black algae: these appear as black, slimy spots. They are found on the walls and bottom of pools as well as on the joints of the tiles if your pool has this type of coating.
  • Mustard algae: as their name suggests, they have a yellowish colour and also settle on the bottom and walls of your pool. However, unlike other algae, they are easy to remove and prefer shady areas to grow.
  • Pink / red algae: red or bright pink in colour, these algae generally grow on plastic coatings. They are therefore found on skimmer baskets, cleaners, sealed parts, ... .

Comment prévenir l’apparition d’algues ?

  • Maintenez un pH normal compris entre 7 et 7,4. Basic water is a favourite playground for algae. The higher the pH (8 and above), the more likely they are to settle in your pool.
  • Check the chlorine level (chlorine acts on the disinfection of the water and fights against the appearance of algae). If you are using stabilized chlorine, it is recommended to maintain its level between 0.7 and 1.2 ppm and if you are using non-stabilized chlorine , it is recommended to maintain a level between 0.4 and 0.7 ppm.
  • Check your filtration system. During the season, remember to clean it regularly, about once a week. In hot weather, it is advisable to turn on the filtration system at night. 
  • Clean your pool walls and bottom regularly.

How do I remove algae from my pool?

Algae growth in your pool causes deposits on the walls and bottom of your pool. The appearance of algae means the presence of several types of bacteria, some of which are dangerous for the health of bathers. It is therefore essential to intervene quickly to preserve your equipment and protect your health. But, the development of algae in your pool will no longer be a chore now that you know how to react to their appearance.