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In recent years, the incidence of yellow brown spots on the pool liner has increased. These stains appear above or on the waterline of the pool. They are so persistent that they cannot get rid of any detergent. If we use a stronger solution on a dissolving base, there is a real risk of damage the pool liner.
What is the main reason: Interestingly, such stains appear in a small number of pools. This is not about the material because such stains appear on the film of all manufacturers.
Why do stains appear only in the waterline area and not in the entire pool? Why only in a few pools? The analysis of the stained areas showed that it was a coloring and penetration through sun oils of a high protection factor. It is mostly about special sun protection oils with a factor of more than 20, which do not dissolve in the water and which hold very long.
The tests also show that copper has a big role for the appearance of the stains.
Sun cream plays the role of a carrier and copper is a coloring agent. Most likely, sun oil and copper react with each other, and copper cannot be oxidized by chlorine in water. This statement is evidenced by the following circumstances:
Why does the waterline only stain? Because the beach oil floats on the surface of the water. It is durable and does not dissolve.
Some sun protection oil producers are warning of textile staining. This phenomenon does not appear only in liner pools. It is also observed in fiberglass pools, glass ceramics, even on glass.
What is the solution: The only solution is to stick a new piece of liner onto the coloured spot.
How to prevent the appearance of stains? Take a shower before you go in the swimming pool. Have in mind that some of the sun oils are very strong that even from the water do not fall so easily.
Also regularly clean the waterline even if there is a visible lack of dirt.
How copper enters the water: It is contained in combined water maintenance preparations. Part of the copper is also contained in the drinking water. Copper can be filtered from the pool water by using a flocculants.
Summary: If it is possible, avoid special sun oils with a very high factor. If any of these are used, avoid the use of combined copper containing preparations. Copper should be filtered by flocculants.