Also called a drain & clean, an acid wash becomes necessary if the pool has turned into the “black lagoon”. This may occur if the pool has not been maintained properly, or if the pool has been stagnant for a period of time so that algae has taken over, and is also filled with leaves and debris causing staining.
A general rule of thumb for determining the need for an Deep Clean is – if you can see the bottom of the shallow end floor, then you can [probably] bring it back with chemicals, cleaning and [effective] filtering. If the floor is not visible, the cost of the chemicals and labor may exceed the acid washing charge, and take much longer. Also, extensive algae blooms or neglect will stain plastered pools, making an acid wash pool desirable, refreshing the surface and leaving the swimming pool looking lighter and clean.
Pool surface deep clean is the purposeful stripping of a thin layer, exposing a fresh layer beneath. You know how you can go to a dermatologist and have your face exfoliated with a mild acid? The thin, top layer of skin is removed, revealing newer, younger skin underneath. Therefore, it is not advised to make it an annual custom. Maybe every 5 – 7 years depending on the look of the walls and floor.
You may also decide to acid wash swimming pool not because of swamp conditions, but just to bring out a brighter, whiter finish. Mineral stains and/or deposits, chlorine stains, even dirt stains… a deep clean is always a dramatic aesthetic improvement to a plastered pool or fountain.
If your pool has had years of algae blooms, and if your pool seems to grow algae overnight or just bloom very easily, and you’ve tried everything else – changing the water and deep cleaning the surfaces can give you an algae-free summer. Changing the filter media at the same time is also recommended.
After the process, your pool can look near new again.