1. Identify the cause of stain by examining the tiles.
2. If the pool water is the cause of the problem, drain the water and refill using softened water.
3. Remove organic stains using a stiff brush or by use of a chemical enzyme to eat away organic matter. However, it is important to avoid using harsh chemicals that might destroy your tiles.
4. Remove stains related to metals using ascorbic acid.Metal stains are either reddish, brownish or greenish and they are very stubborn. Such stains can only be removed using ascorbic acid or diphosphonic acid. These powerful chemicals remove stains instantly once applied.
5.Test the pool water and take necessary measures to prevent future development of stains.