Removing green algae biologically: an environmentally friendly method
Removing green algae biologically is better for the environment and for the surface. Discover which methods are effective.

What you need for this tutorial;
Want to remove green algae in a biological and environmentally friendly way? With Osmo Terrasreiniger, you get a clean and fresh wooden deck. This product is ideal for effectively removing algae, moss and dirt from wood.
Benefits of Osmo Terrasreiniger
Osmo Terrasreiniger is an efficient and sustainable solution for removing green algae, algae and moss. The main benefits are:
- Environmentally friendly and biodegradable
You dilute the cleaner with water, depending on how dirty the surface is.
- Efficient cleaning
Removes algae and moss without damaging the surface.
- High yield
One liter of cleaner is enough for 30 to 100 m², depending on how dirty the surface is.
- User-friendly
Easy to apply and to dilute.
- Natural ingredients
Contains plant-based oils.
Video: Removing green algae biologically
In this video you will see how to remove green algae from wood.

Groene aanslag verwijderen: hoe verwijder ik groene aanslag?
Step-by-step plan: removing green algae with a biological cleaner
Follow these simple steps to remove green algae from wooden surfaces. Osmo Terrasreiniger is a cleaner that lets you thoroughly clean wooden decks, decking and garden furniture.
Preparing the surface
- Remove loose leaves, sand and other dirt with a brush, such as the Osmo patio brush, or a broom.
- Make sure the surface is dry, so the cleaner can do its job properly.

Diluting Osmo Terrasreiniger
Mix the Terrasreiniger with water. For light green algae, use a ratio of 1:25. For stubborn green algae, you can use a mixing ratio of 1:1.

Applying the cleaner
- Apply the diluted solution evenly to the surface. Use an Osmo patio brush or a garden sprayer for this.
- Make sure you cover all spots with green algae well.

Let it work
Let Osmo Terrasreiniger work for 10 to 15 minutes. This loosens the algae and moss from the surface.

Scrub and clean
Scrub the surface thoroughly in the direction of the wood grain. Avoid using a pressure washer, as it can damage the surface.

Rinse
Rinse the surface thoroughly with water. Let it dry in the sun so you can properly assess the result.

Follow-up treatment
After cleaning, you can apply a protective layer. For wooden surfaces, Osmo Terras-Olie (horizontal wooden parts) or Osmo UV-Beschermingsolie (vertical wooden parts) is ideal. These products protect against moisture and dirt, making the wood easier to keep clean. For stone surfaces, you can use Osmo Steen en Terracotta Olie to extend their lifespan.
Tips for a long-lasting result
- Regular maintenance: clean your deck at least twice a year to prevent new green algae.
- Good drainage: make sure there is enough sunlight and water drainage, so moisture does not build up on tiles or wooden surfaces.
- Use natural products: avoid aggressive products such as chlorine or vinegar, as these can be harmful to the soil and plants.
Supplies
Maintenance advice
- Use Osmo Terrasreiniger periodically to remove light soiling and green algae, preferably in spring and autumn.
- Apply a protective oil to your wood or tiles for extra durability.
- Keep your deck free of leaves and dirt to prevent moisture from building up.
Frequently asked questions about removing green algae
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