I Have Brown Stains In My Pool!

A pristine, sparkling pool is a summer dream, but the sudden appearance of brownish-orange stains can quickly turn this dream into a nightmare. Understanding the causes of these unsightly stains and knowing how to effectively remove and prevent them is crucial for any pool owner. Let’s dive into the common culprits and the best remedies for brownish-orange staining in pools.

Brown stains in pools are typically caused by organic debris or high iron content in the water.

Causes of Brown Staining

1. Iron Contamination:

   • Source: Iron can enter your pool from various sources such as well water, corroded pool equipment, storm runoff, rebar in the pool structure, or even rain water.

   • Reaction: When iron is exposed to chlorine, it oxidizes and forms rust-colored stains on the pool surfaces.

2. Organic Debris:

   • Source: Leaves, algae, pollen, and other organic materials can settle in your pool and decompose.

   • Reaction: These materials can release tannins and other substances that stain the pool’s surfaces in shades of brown or orange.

3. Low pH Levels:

   • Source: Improper pool chemistry, specifically low pH levels, can cause the water to become acidic.

   • Reaction: Acidic water can corrode metal fixtures and equipment, releasing metals like iron and copper into the water, which then oxidize and cause staining.

Remedies for Brown Staining

1. Metal Sequestrants:

   • Function: Metal sequestrants bind to metal ions in the water, preventing them from oxidizing and staining the pool surfaces.

   • Application: Regularly add a metal sequestrant to your pool according to the manufacturer’s instructions to keep metal ions in suspension.

2. Ascorbic Acid Treatment:

   • Function: Ascorbic acid (vitamin C) can effectively remove iron-based stains.

   • Application: Sprinkle ascorbic acid directly on the stains. They should begin to disappear within a few minutes. Follow up with a thorough water test and adjust the pool’s chemical balance as needed.

3. Proper Pool Chemistry Maintenance:

   • Function: Maintaining balanced pool chemistry prevents the conditions that lead to staining.

   • Application: Regularly test your pool water and adjust the pH, alkalinity, and chlorine levels. Aim for a pH between 7.2 and 7.6 and total alkalinity between 80 and 120 ppm.

4. Stain-Specific Treatments:

   • Function: Specialized stain removers target specific types of stains.

   • Application: Identify the type of stain and use a product designed for that particular issue, following the instructions carefully.

5. Filtration and Circulation:

   • Function: Efficient filtration and water circulation help remove contaminants and prevent staining.

   • Application: Ensure your pool’s filtration system is functioning properly and run it for an adequate amount of time daily. Clean or replace the filter as necessary.

6. Preventive Measures:

   • Function: Preventing contaminants from entering the pool minimizes staining risk.

   • Application: Trim nearby vegetation. Avoid using well water, or treat it before filling the pool. Use a weekly stain preventative.

Conclusion

Brown stains in pools are usually caused by iron contamination, organic debris, low pH levels, or high iron content in fill water. By understanding these causes, you can effectively address and prevent staining. Regular maintenance, proper chemical balancing, and the use of appropriate treatments can help keep your pool clean and inviting all year round. For persistent issues, consulting a pool professional can provide additional solutions tailored to your specific situation.