Miami Pools: Salt Water Lies Hiding Toxic Lungs?

By Franklin Everett Shaw

December 18, 2025

The air hangs heavy with humidity, the scent of sunscreen mingling with something…else. It’s a familiar smell to anyone with a pool in Miami-Dade County, but what if that “pool smell” is more than just chlorine? What if it’s a sign of something potentially harmful lurking in the water and air around your backyard oasis?

Let’s dive into the often-overlooked issue of chloramine off-gassing from saltwater pools and how it might be impacting your respiratory health, and more importantly, what you can do about it, right here in South Florida.

Saltwater pools, despite their name, still rely on chlorine. A salt chlorine generator converts salt into chlorine through electrolysis. This chlorine then sanitizes the pool water. The problem arises when chlorine reacts with organic matter – sweat, sunscreen, leaves, even urine (yes, it happens!) – forming chloramines.

These chloramines, unlike chlorine itself, are what cause that pungent “chlorine” odor. They’re also responsible for skin and eye irritation, and, more seriously, respiratory problems. They off-gas, meaning they escape the water and become airborne, concentrating in the air around the pool, especially in poorly ventilated areas like screened-in enclosures, a common feature in Miami-Dade backyards.

So, what makes this a bigger concern in Miami-Dade? Several factors contribute:

• High Bather Load: More people using the pool means more organic matter introduced, leading to more chloramine formation. Think of those weekend pool parties.
• Intense Sunlight: While UV light can break down some chloramines, it also accelerates the breakdown of chlorine, potentially leading to inconsistent sanitation and more chloramine formation if not properly managed.
• Enclosed Pool Areas: Many Miami-Dade pools are enclosed by screens or lanais, which, while keeping bugs out, also trap chloramine gases, increasing exposure.
• Warm Water Temperatures: Warmer water encourages the growth of algae and bacteria, increasing the demand for chlorine and potentially leading to chloramine buildup.

Now, let’s get practical. How do you know if you have a chloramine problem, and what can you do about it?

Assessing Your Risk:

• The Sniff Test: Does your pool area have a strong, pungent “chlorine” smell, even when the chlorine levels are supposedly normal? That’s a red flag.
• Eye and Skin Irritation: Do you or your family members experience red, itchy eyes or dry, irritated skin after swimming?
• Respiratory Symptoms: Do you experience coughing, wheezing, or shortness of breath while around the pool? This is especially concerning for individuals with asthma or other respiratory conditions.
• Water Testing: Invest in a comprehensive water test kit that measures not just free chlorine and pH, but also combined chlorine (chloramines). Ideally, combined chlorine levels should be below 0.2 ppm.

Actionable Steps to Mitigate Chloramine Risks:

1. Ventilation is Key: This is the single most important factor. If your pool is enclosed, ensure adequate ventilation.

   • Natural Ventilation: Open windows and doors to create cross-ventilation.
   • Mechanical Ventilation: Install exhaust fans to draw out stale, chloramine-laden air. Consider a whole-house ventilation system with heat recovery (HRV) or energy recovery (ERV) for energy efficiency.
   • Pool Covers: While they help retain heat and reduce evaporation, pool covers can also trap chloramines. Remove the cover regularly to allow the pool to “breathe.”

2. Pool Maintenance Best Practices:

   • Regular Superchlorination (Shocking): Periodically shock your pool to break down chloramines. Follow the manufacturer’s instructions carefully. Do this in the evening to minimize chlorine loss due to sunlight.
   • Maintain Proper Water Chemistry: Regularly test and adjust pH, alkalinity, and calcium hardness. Imbalances can affect chlorine effectiveness and increase chloramine formation.
   • Brush and Vacuum Regularly: Remove debris and algae from the pool surfaces to reduce the organic load.
   • Clean the Filter: A dirty filter reduces water circulation and sanitation effectiveness. Backwash your filter regularly.
   • Cyanuric Acid (Stabilizer): While it protects chlorine from sunlight, excessive cyanuric acid can reduce chlorine’s effectiveness. Keep levels within the recommended range (30-50 ppm).

3. Alternative Sanitation Methods:

   • UV Systems: Ultraviolet (UV) light systems can effectively destroy chloramines and other contaminants. They are installed in the pool’s circulation system.
   • Ozone Systems: Ozone is a powerful oxidizer that can break down chloramines and other organic matter. Ozone generators are also installed in the circulation system.
   • Mineral Systems: Mineral systems, such as those using silver and copper ions, can reduce the need for chlorine.
   • Advanced Oxidation Processes (AOPs): AOPs combine UV light, ozone, and hydrogen peroxide to create highly reactive hydroxyl radicals that can destroy a wide range of contaminants.

4. Bather Hygiene:

   • Shower Before Swimming: Encourage swimmers to shower before entering the pool to remove sweat, sunscreen, and other contaminants.
   • Avoid Urinating in the Pool: This is a major source of chloramine formation. Provide convenient restroom access.

Common Mistakes and Pitfalls:

• Over-reliance on Salt Chlorine Generators: Thinking that a saltwater pool is “chlorine-free” and neglecting proper water chemistry.
• Insufficient Ventilation: Trapping chloramines in enclosed pool areas.
• Infrequent Shocking: Allowing chloramine levels to build up over time.
• Ignoring Water Chemistry Imbalances: Failing to maintain proper pH, alkalinity, and calcium hardness.
• Not Cleaning the Filter Regularly: Reducing water circulation and sanitation effectiveness.
• Using Cheap Test Kits: Inaccurate readings can lead to improper chemical adjustments. Invest in a quality test kit or hire a professional pool service.

Real-World Scenario:

Let’s say you live in a single-family home in Kendall, Miami-Dade County, with a screened-in pool. You’ve noticed a strong “chlorine” smell lately, and your kids have been complaining about itchy eyes after swimming. You test your water and find that your free chlorine is within the recommended range, but your combined chlorine is high (above 0.5 ppm).

Here’s what you can do:

1. Increase Ventilation: Open the screen doors and windows around the pool area to improve airflow. Consider installing an exhaust fan in the screen enclosure.
2. Shock the Pool: Superchlorinate the pool according to the manufacturer’s instructions.
3. Adjust Water Chemistry: Test and adjust pH, alkalinity, and calcium hardness as needed.
4. Clean the Filter: Backwash the filter thoroughly.
5. Consider a UV System: If the problem persists, consider installing a UV system to destroy chloramines.

By taking these steps, you can significantly reduce chloramine levels and create a healthier pool environment for your family.

Don’t let the “pool smell” ruin your Miami-Dade pool experience. By understanding the science behind chloramine off-gassing and implementing these practical solutions, you can breathe easier and enjoy your backyard oasis to the fullest. Remember, a little proactive maintenance goes a long way in ensuring a safe and healthy swimming environment for everyone.