The Role of Stabilizer in Your Pool or Spa

In our pools and spas, we rely on chlorine as a primary sanitizer to keep the water clean. However, chlorine is inherently unstable and can be quickly degraded by the sun’s ultraviolet (UV) rays and high temperatures, reducing its effectiveness.

To combat this, we use a stabilizer, also known as cyanuric acid. This compound acts as a protective shield for chlorine, safeguarding it from the adverse effects of UV light and heat. By doing so, it ensures that the pool remains sanitary and safe for swimmers throughout the day and also helps in reducing the frequency and quantity of chlorine additions required to maintain adequate disinfection levels.

Research has shown that pools without a stabilizer can lose up to 90% of their total chlorine within just two to three hours on a sunny day. In contrast, pools with 25 to 50 milligrams per liter of cyanuric acid lose only about 10 to 15 percent of their total chlorine under similar conditions (White et al., 1972).

The ideal concentration of stabilizer in your pool should be around 50 ppm, with acceptable levels ranging from 40 to 80 ppm. If you’re using a chlorine product that already contains a stabilizer, you may not need to add any additional stabilizer. However, if the stabilizer levels become too high, it’s advisable to switch to a non-stabilized chlorine product until the levels drop back within the recommended range.

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