Algae removal


Algae formation

Algae formation can sometimes be a persistent problem. Despite a correct chlorine level, in certain situations algae can still grow in the pool and even ‘get used’ to a certain chlorine level. This then results in green deposits on the walls, cloudy (green) water or fluffy spots.

Roughly speaking, there are two different types of algae that you can find in a swimming pool:

  • Floating algae: green and mustard algae. These usually settle on the walls of the pool and can often easily be brushed off. Or they float in the water and can turn the water green.
  • Black algae look a bit ‘fluffy’ and often settle in places where the flow is minimal. For example the stairs or in deeper parts of the pool.

Removing algae

Brush the algae away first, then apply a chlorine shock with Melpool 55/G or Melpool 70/G. Then flocculate the dead algae with a flocculant. Then, if necessary, remove the flakes from the bottom with a swimming pool vacuum cleaner and rinse or clean the (sand)filter well.

Advice: Do the algae not go away despite a chlorine shock? In that case, the chlorine stabilizer content (cyanuric acid) is probably too high. If this value is too high, you should refresh a part of your pool water.

Anti-algae: In case the algae come back quickly due to a high biological load of the water or because certain places in the pool do not have a good flow, an anti-algae agent can be dosed. Melpool has developed various anti-algae products;

  • Melpool QAC: extra powerful anti-algae agent with a broad anti-algae spectrum, ready to dose.

  • Melpool JET: flocculant that does not foam. Especially for pools with counter-current and for whirlpools. 

  • Melpool WIC: QAC-based anti-algae agent specially formulated as an overwintering agent. Ensures that the pool remains free of algae even when the pool i not being used. As a result, there will be less organic deposits on the walls when the pool is restarted after the winter break.


  • Always read the label and product information before use
  • Don’t over-dose! The water may then foam or become cloudy
  • Only for swimming pools, not for (swimming) ponds. Can disturb the biological balance

Products for algae removal

Algaecide for swimming pools.

For preventing algae. High quality algaecide, also prevents black algae. Compatible with chlorine. Ideal as a wintering product.