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Staining of the pool is caused by metals in the water or by material left in the pool. If you let children play with toys in the pool that have metal in it, it can cause rust stains on the pool wall. Leaves will leave brown stains, also if you have ducks using your pool as their winter resort they will leave stains.
Depending on the stains there are several ways to treat them. We will advise you on the best way and what chemicals that are needed for the job. It may be a simple thing like scrubbing with a stiff brush or it may be more difficult and need to be treated with chemicals.