Magnesium Stains: Depending on the type of water you fill your pool with magnesium may be present. Too much magnesium in your pool can cause discoloration such as pink, red, and even black. Magnesium stains can be removed through pool acid washing.
Copper Stains: Similar to magnesium stains, copper stains also occur when your pool’s source water comes from well water—typically high in all minerals. Copper stains create blue, green, and black staining in your pool, however, can be removed through pool acid washing.
Hard Water: Hard water stains, also known as scum, are created from calcium deposits. These deposits can often be found along the edge of your pool where the tile meets the water. Hard water stains lead to cloudy water and a lower (and unsafe) water pH level. Hard water stains can also be removed through pool acid washing.
Algae Growth: Algae growth is the most common type of staining that pool owners look to get removed through pool acid washing. Lack of pool cleaning, poor pool pH balance, and low pool circulation are all causes of algae growth. The algae growth can cause health issues along with clogged pool filters. Pool acid washing can help remove algae growth and prevent any further damage from occurring to you or your oasis.