Acid wash

Also Known As: Acidwash

Acid washing is a cleaning process that can remove stains and algae spores from a pool’s finish. After winterizing, algae may remain the pores of the plaster coating. If left there, these spores can grow and stain the surface.

To determine if an acid wash is necessary, look at the pool’s water. If the bottom of the pool is not visible, an acid wash may be a reliable option. However, if the water is merely cloudy, chemicals and pumping should be all that is needed to clean the water and surface.

To acid wash a pool, follow these steps. First drain the pool. Then spray the sides and bottom with water to hydrate the surface, before coating the surfaces with diluted acid. The acid interacts with the pool’s surface to remove debris along with a thin layer of plaster. Because these chemicals are dangerous, it is important to wear protective clothing and gear, which includes a properly-fitting chemical respirator. Care should also be taken in transporting the acid safely. Finally, neutralize the pool surface after acid washing, to prevent ongoing damage to the plaster, and dispose of dirty water properly.

Acid washing can also used to bring out a bright finish on a stained pool, but it is a harsh process and should not be used annually. Special care should be taken for indoor applications. This process should never be used on vinyl-lined pools.