What is the cause of and how can you remove a complete light brown discoloration gunite pool walls?

Cause:

The most common cause of light brown discoloration on gunite pool walls is the presence of metals, such as iron, copper, or manganese, in the pool water. These metals can come from a variety of sources, including the water supply, pool chemicals, or even the pool equipment. When these metals react with the chemicals in the pool water, they can form brown stains on the pool walls.

Removal:

There are a few different ways to remove light brown discoloration from gunite pool walls. The most effective method will depend on the specific cause of the discoloration.

* If the discoloration is caused by iron: You can use a commercial iron stain remover or a homemade solution of baking soda and vinegar. To use the baking soda and vinegar solution, mix equal parts baking soda and vinegar in a bucket. Apply the solution to the stained areas of the pool walls and scrub with a brush. Rinse the pool thoroughly afterwards.

* If the discoloration is caused by copper: You can use a commercial copper stain remover or a homemade solution of muriatic acid and water. To use the muriatic acid and water solution, mix 1 part muriatic acid with 10 parts water. Apply the solution to the stained areas of the pool walls and scrub with a brush. Rinse the pool thoroughly afterwards.

* If the discoloration is caused by manganese: You can use a commercial manganese stain remover or a homemade solution of potassium permanganate and water. To use the potassium permanganate and water solution, mix 1 part potassium permanganate with 10 parts water. Apply the solution to the stained areas of the pool walls and scrub with a brush. Rinse the pool thoroughly afterwards.

It is important to note that these are just general guidelines. The specific treatment method that you use may vary depending on the specific cause of the discoloration and the type of pool surface. If you are unsure of how to remove the discoloration, you should contact a pool professional for assistance.