Keep your pool clean
Over time, your swimming pool will ultimately experience periods when PH control and high mineral content in your pool water becomes a challenge to control. When this occurs, you end up with unsightly brownish stains. Don't get frustrated.
You should always hire a local pool cleaning service company who have experience doing acid washes to perform the acid wash. The muriatic acid is a toxic chemical and needs to be handled as such. If the acid is left too long on the pool plaster it will literally start burning into the plaster. It is also crucial to understand how the Arizona heat can damage the interior of a pool if it is left drained for too long. Make sure you get the right information on if you can drain your pool in the middle of the summer.
You may also decide on an acid wash not because of swamp conditions, but just to bring out a brighter, whiter finish. Mineral stains and/or deposits, chlorine stains, even dirt stains...an acid wash is always a dramatic aesthetic improvement.
If your pool has had years of algae blooms, and if your pool seems to grow algae overnight or just bloom very easily....changing the water and acid washing the surfaces algae sticks to can provide an algae free summer.