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Why Maintaining Optimal Cyanuric Acid Levels is Crucial for Your Pool This Summer

Why Maintaining Optimal Cyanuric Acid Levels is Crucial for Your Pool This Summer

EZ Pools |

As summer temperatures rise, so does the bather load of your pool! Ensuring a clean, safe, and enjoyable swimming experience requires diligent pool maintenance, and one key aspect that often gets overlooked is maintaining optimal Cyanuric Acid (CYA) levels. Understanding the role of CYA and keeping its levels balanced can make a significant difference in your pool's look, feel, and cost to maintain.

What is Cyanuric Acid?

Cyanuric acid is a stabilizing chemical added to pool water to protect chlorine from being degraded by the sun’s ultraviolet (UV) rays. Also known as pool stabilizer or conditioner, CYA helps maintain the effectiveness of chlorine, ensuring it remains in the water long enough to sanitize and keep your pool clean.  Many pool professionals compare Cyanuric Acid to "Sunscreen", which you'd use to protect yourself from the UV Rays!

The Role of Cyanuric Acid in Your Pool

  1. Chlorine Protection: Chlorine is essential for killing bacteria and keeping your pool water clear. However, direct sunlight can rapidly break down chlorine, reducing its effectiveness. Cyanuric acid forms a protective bond with chlorine, shielding it from the sun’s UV rays and prolonging its lifespan in the water.

  2. Cost Efficiency: By stabilizing chlorine, CYA helps reduce the amount of chlorine you need to add to your pool. This not only keeps your pool water sanitized but also saves you money on chemicals over the long summer months.

  3. Consistent Water Quality: Maintaining optimal CYA levels ensures a steady supply of active chlorine, which is crucial for preventing algae growth, bacterial contamination, and cloudy water. This consistency is particularly important during summer when your pool sees the most use.

Optimal Cyanuric Acid Levels

The ideal range for cyanuric acid in a pool is typically between 30 and 50 parts per million (ppm). Levels above 50 ppm can lead to overstabilization, where chlorine becomes less effective, causing potential issues like algae growth and cloudy water. Conversely, levels below 30 ppm can result in rapid chlorine loss due to UV exposure.

How to Maintain Optimal CYA Levels

  1. Regular Testing: Frequently test your pool water using reliable test kits or strips to monitor CYA levels. It’s a good practice to test at least once a week, especially during the summer.

  2. Controlled Addition: When adding cyanuric acid to your pool, follow the manufacturer’s instructions carefully. It’s essential to dissolve CYA in a bucket of water before adding it to your pool to prevent undissolved granules from damaging pool surfaces.

  3. Partial Drains and Refills: If CYA levels become too high, the best way to reduce them is by partially draining your pool and refilling it with fresh water. This dilution process helps bring CYA levels back to the optimal range.

  4. Consistent Chlorine Levels: Keep your chlorine levels balanced alongside CYA levels. Using stabilized chlorine products, which already contain CYA, can help maintain both levels simultaneously.

Unforeseen Problems

When Cyanuric Acid levels get too high, your pool may still have a balanced chlorine level, but you see algae start to grow around the pool surface.  How could that be? 

Well, Cyanuric Acid often blocks Chlorine from doing it's job, if the levels get too high.  An industry standard formula is that the pool requires 7.5% of the total CYA reading in chlorine parts per million (PPM) to even work effectively.

For example, if your CYA level is at 40ppm, the start point that your chlorine will need to be in order to kill bacteria is 3ppm.  If your chlorine drops under a 3ppm, the chlorine will become way less effective, and signs of cloudy water & algae growth may start to appear.


Maintaining optimal cyanuric acid levels is crucial for ensuring a safe, clean, and enjoyable swimming experience in your pool this summer. By protecting chlorine from UV degradation, reducing chemical costs, and maintaining consistent water quality, CYA plays a vital role in effective pool management. Regular testing and careful maintenance will keep your pool in top condition, allowing you to enjoy the refreshing benefits of your pool all summer long.

Stay vigilant with your pool care routine, and your pool will reward you with crystal clear waters and a safe environment for all your summer fun!