How to Treat a Pool with Black Algae

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How to Treat a Pool with Black Algae: An In-depth Guide

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Struggling with black algae in your pool? Learn how to treat a pool with black algae effectively. Get insights from Riviera Pools of Dallas on tackling stubborn algae.


The topic of how to treat a pool with black algae is one that should not be taken lightly. Black algae is a highly resilient form of algae that can become deeply rooted in a pool’s surfaces, making it difficult to eliminate. As experts in the field of pool maintenance, Riviera Pools of Dallas aims to provide an informative guide that outlines the procedures and chemical treatments that are most effective in combating this stubborn intruder.

Identification and Risks

Before proceeding with treatments, it’s crucial to identify the presence of black algae accurately. Unlike other forms of algae, black algae appear as dark black or blue-green spots, usually on the pool’s bottom or sides. These spots have a gelatinous layer that protects them from chemicals, making them highly resilient.

Tools and Materials Needed

  • Pool brush with stainless steel bristles
  • High-concentration chlorine solution
  • Algaecide specifically designed for black algae
  • Protective gloves and eyewear

Pre-treatment Preparations

  1. Leak Detection: Before treating the pool for black algae, it’s advisable to perform a leak detection as water loss could affect the efficiency of the treatment.
  2. Equipment Check: Inspect your pool’s pump, filter, and other hardware for any signs of wear or damage that could affect circulation. Riviera Pools of Dallas offers both equipment repair and equipment replacement services.
  3. Pool Automation: If your pool features an automation system, ensure it is set to run the pump and filtration system continuously during the treatment phase.

Steps on How to Treat a Pool with Black Algae

  1. Initial Brushing: Using a stainless steel pool brush, rigorously scrub the affected areas. This action breaks the protective layer and allows chemicals to penetrate the algae.
  2. High Chlorine Treatment: Apply a high-concentration chlorine solution directly to the brushed areas. Allow the pool pump to circulate the chlorine throughout the pool.
  3. Apply Algaecide: Use an algaecide specifically designed to kill black algae. Make sure to follow the manufacturer’s guidelines. You can find various effective products from Pentair for this purpose.
  4. Continuous Brushing: For the next several days, it’s essential to brush the pool continuously to prevent the black algae from re-establishing its protective layer.
  5. Ongoing Maintenance: Once the black algae have been effectively removed, ongoing maintenance involving periodic chlorination and regular brushing is critical for preventing a recurrence.

Troubleshooting and Additional Services

  1. Structural Concerns: Black algae can sometimes hide in cracks or structural defects in the pool. Make sure to address these issues promptly.
  2. Plumbing Repair: Poor water circulation can be a contributing factor to algae growth. If you suspect issues, consider plumbing repair services.


Understanding how to treat a pool with black algae is crucial for maintaining a healthy and clean swimming environment. The process may seem daunting, but with the right knowledge and products, it is entirely manageable. If you have any questions or need professional assistance, Riviera Pools of Dallas is always here to help. Reach out to us at Phone Number: 214-351-2071 or Email Address:

Remember, prevention is better than cure. With the correct approach and regular maintenance, you can keep black algae at bay, ensuring a clean and inviting pool for everyone to enjoy.

This guide on how to treat a pool with black algae serves as a starting point, but every situation may require a tailored solution. Be vigilant, act swiftly, and don’t hesitate to seek professional help when dealing with this stubborn form of algae.

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