Have you noticed any mysterious red, green, or black stains on your pool’s walls or floors? Your pool might be crying out for help against metal stains!
Metal stains can result from metal ions in the water. These metal ions react with imbalanced pool water and precipitate, sticking to the fibreglass surface and causing stains.
The most common metal stains are from iron, copper, and manganese, resulting in the abovementioned colours.
Regularly checking water chemistry and using metal sequestrants will help prevent these stains.
To remove preexisting stains, try rubbing a plain, uncoated Vitamin C tablet directly on the stain. The ascorbic acid in the tablet will react with the metal (particularly iron), lifting the stain from the surface.
You can also try Hy-Clor stain remover which is suitable for fibreglass surfaces, some light scrubbing with a gentle brush, and then running your vacuum or cleaner over your pool to pick up any loosened metallic debris.