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Is it OK to swim in a pool with algae?

Published in Pool Maintenance 3 mins read

It is generally not recommended to swim in a pool with algae, regardless of how mild or severe the growth may be.

Why You Should Avoid Swimming in Algae-Infested Pools

Swimming in a pool that contains algae poses several health and safety concerns. It's crucial to address algae growth promptly before using the pool.

Safety Hazards

One of the primary dangers of algae in a pool is the increased risk of physical injury. Algae can create an extremely slippery surface, particularly on the bottom of the pool and around its edges. This slipperiness can easily lead to slips and falls, posing a significant injury risk to anyone entering or moving within the pool. This is especially hazardous for children, the elderly, or individuals with mobility issues.

Potential Health Concerns

Beyond the physical safety hazards, the presence of algae often indicates an imbalance in pool chemistry. While algae itself is not typically harmful to humans, its presence suggests that the pool is not properly sanitized. This creates an environment where harmful bacteria and pathogens, such as E. coli or Giardia, can thrive. Exposure to these microorganisms can lead to various issues, including:

  • Skin irritations: Such as rashes or itching.
  • Ear infections: Commonly known as swimmer's ear.
  • Gastrointestinal problems: Including nausea, vomiting, or diarrhea, particularly if contaminated water is ingested.
  • Respiratory issues: Especially for sensitive individuals or those with pre-existing conditions.

Steps to Take If Your Pool Has Algae

If you discover algae in your pool, it's essential to take immediate action to clean and treat it before resuming swimming. Follow these steps for effective algae removal and prevention:

  1. Test Water Chemistry: Begin by testing your pool's pH, alkalinity, calcium hardness, and sanitizer levels. Imbalances contribute to algae growth.
  2. Shock the Pool: Apply a high dose of chlorine (or a non-chlorine shock) to kill the algae and any accompanying bacteria. Follow product instructions carefully.
  3. Brush the Pool Surfaces: Vigorously brush the walls, floor, and any other surfaces to dislodge algae. Pay special attention to corners and crevices.
  4. Run the Filter: Operate your pool filter continuously for at least 24-48 hours, or until the water clears. Backwash or clean the filter regularly during this process.
  5. Consider Algaecide: After shocking and brushing, you may add a quality algaecide to prevent future growth and help clear lingering spores.
  6. Maintain Proper Balance: Once the pool is clear, consistently monitor and maintain optimal chlorine levels and pH balance to prevent future algae outbreaks.

Always ensure your pool water is clear, properly balanced, and free of visible algae before allowing anyone to swim.