A guide for getting rid of blackspots from your swimming pool surface


Swimming pools are a source of joy and relaxation, but they can also be a breeding ground for various issues. One common problem faced by pool owners is the formation of black spots on the surface. These spots not only compromise the pool’s aesthetics but also pose potential health risks. In this guide, we will explore the different types of black spots, understand why they occur, and learn effective methods to remove and prevent them.

Understanding Black Spots

Black spots on swimming pools can be caused by algae, mold, or mineral deposits. Algae thrive in poorly sanitized water, while mold develops in damp and dark areas. Mineral deposits occur due to imbalanced pool chemistry. Identifying the type of black spot is crucial for effective removal and prevention strategies.

Importance of Removing Black Spots

Beyond their unsightly appearance, black spots can be hazardous. Algae and mold can cause skin irritations and respiratory problems, especially in individuals with allergies. Moreover, these spots indicate underlying issues with pool water quality, which, if not addressed, can lead to more significant problems.

Methods to Identify Black Spots

To tackle the problem effectively, it’s essential to identify the type of black spot correctly. Algae spots are usually greenish-black, mold spots are fuzzy and irregular, while mineral deposits appear as small, dark dots. Proper identification ensures the use of suitable removal methods.

Prevention Techniques

Maintaining proper pool chemistry is fundamental in preventing black spots. Regularly test the water, adjust pH levels, and ensure adequate circulation and filtration. Additionally, routine cleaning of the pool walls and floor can prevent the growth of algae and mold.

DIY Removal Methods

For minor black spots, a do-it-yourself approach can be effective. Start by brushing the affected area vigorously, then shock the pool with chlorine. Follow up with algaecide treatment if necessary. It’s crucial to wear protective gear and follow instructions on chemical usage.

Professional Removal Services

In cases of severe contamination or persistent black spots, it’s advisable to seek professional pool cleaning services. Professionals have the expertise and specialized equipment to thoroughly clean and sanitize the pool, ensuring all traces of black spots are removed.

Tips for Keeping the Pool Spotless

To maintain a spotless pool, regular cleaning and proper chemical balance are essential. Skim the pool surface, vacuum the pool floor, and clean the walls regularly. Also, ensure the pump and filter are functioning optimally to prevent stagnation, which can lead to the growth of black spots.

Common Mistakes to Avoid

One common mistake is neglecting proper pool maintenance. Ignoring routine cleaning and chemical balance allows black spots to thrive. Additionally, using excessive chemicals without proper knowledge can damage the pool surface and worsen the problem.


Removing and preventing black spots on your swimming pool requires vigilance and a proactive approach to maintenance. By understanding the different types of black spots, identifying them correctly, and adopting suitable removal and prevention methods, you can enjoy a pristine and safe swimming environment.


Q1: How do I differentiate between algae and mold black spots? A1: Algae spots are greenish-black and slimy, while mold spots are fuzzy and irregular in shape. Algae spots are easier to brush off compared to mold spots.

Q2: Can black spots in my pool harm my health? A2: Yes, black spots caused by algae and mold can lead to skin irritations and respiratory issues, especially in individuals with allergies or sensitive skin.

Q3: How often should I test my pool water for proper chemical balance? A3: It’s advisable to test your pool water at least once a week, especially during the swimming season. Regular testing helps maintain proper pH levels and prevents black spots from forming.

Q4: Can I use bleach to remove black spots from my pool? A4: While bleach is a disinfectant, it may not be effective in removing persistent black spots. It’s better to use pool shock treatments and algaecides specifically designed for swimming pools.

Q5: What should I do if black spots reappear after cleaning my pool? A5: If black spots reappear, it indicates an underlying issue with your pool’s water balance. Perform a thorough water test, adjust the chemical levels, and consider seeking professional help if the problem persists.