Black Spots on Fibreglass Swimming Pools

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Black Spots on Fibreglass Swimming Pools.

Most fibreglass pools will, at some stage, develop black spots on the surface of the pool.

This type of black-spot is not a bacteria but a mineral that bleeds from the inner skin of the fibreglass.

It’s appearance can be delayed and controlled if the water Ph level is kept around 7.2

Some advise on Black-spot treatments from:…20treating.htm

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