Green deposits, dark spots and algae
How to recognise itGreen or dark deposits may be associated with biological growth. Black spots alone prove neither algae nor lichens; wet deposits can also reduce slip resistance.
What we assess and treat
We assess the surface, moisture, joints and an inconspicuous test area. The aim is the mildest effective, material-compatible cleaning method. A suitable professional product is considered only with the appropriate approval and in compliance with environmental requirements.
How the surface is protected
Drainage, regular care and surface protection tailored to the need can make maintenance easier. An impregnating sealer does not guarantee that growth will never return.
What to avoid
No wire brushes, no uncontrolled high-pressure cleaning and no self-mixed chlorine or biocidal products. Cleaning water must not be allowed to run uncontrolled into the pool or garden.







