Having the correct chemical balance in your pool is important to keep your pool tiles clean; for this you may need to know how to shock a pool, but you should also ensure that you regularly check the pool's chemical levels with Swimming Pool Test Strips from Walmart.
If your pool doesn't have enough chlorine then algae can develop, along with a harmful calcium build up on your pool tiles, which can cause them to look bleached. The right amount of chlorine, however, will keep your pool tiles cleaner for longer. The ideal pH level for pools is between 7 and 7.6.