Algae treatment for a concrete balcony at Pakhusene
A dull, grey concrete balcony covered in algae became noticeably brighter and cleaner, and stayed clean for many months afterwards.
A concrete balcony of approx. 6 m² (approx. 4-9 m²) at Pakhusene in Aarhus Ø was heavily discoloured by algae, dirt and traffic dust. Øens HåndværkerCentral used gentle algae treatment and manual cleaning without pressure washing to protect the concrete. The result was a noticeably brighter, cleaner balcony that stayed clean for many months.
- Location
- Pakhusene, Aarhus Ø
- Service
- Algae treatment
- Surface area
- approx. 6 m²
- Duration
- 0.5-1 day
- Treatment
- Algae treatment and gentle cleaning, without pressure washing
See the transformation


The task
The concrete balcony of approx. 6 m² was heavily discoloured by algae, dirt and traffic dust. This affected both its appearance and safety, as the surface became slippery and unsightly in wet weather. The customer wanted to improve its dull appearance without damaging the surface.
The solution
- Gentle algae treatment with a special agent for mineral surfaces
- Subsequent manual cleaning and rinsing of the entire surface
- Gentle cleaning without pressure washing to protect the concrete
The result
The concrete became noticeably brighter and cleaner, losing its dull, grey coating of algae. The treatment lasted, keeping the balcony clean for many months afterwards without damaging the surface.
Efter algebehandlingen ser vores altan ikke bare flot ud, den har holdt sig ren i mange måneder! Og det hele blev gjort til en meget rimelig pris. Kan varmt anbefales.Pia F., Aarhus Ø
Customer review, shown in the original Danish.
Read more about our algae treatment and paving cleaning, or see the guide to black deposits and lichen on paving.