How To Lower Cyanuric Acid In Your Swimming Pool?

How To Lower Cyanuric Acid In Your Swimming Pool

Maintaining a swimming pool can be a complex task, but it is essential to keep the water in your pool clean and safe for swimming. One aspect of pool maintenance that is often overlooked is the level of cyanuric acid, also known as a stabilizer, in the water.

This chemical compound plays an important role in keeping your pool water crystal clear, but if the levels get too high, it can have a detrimental effect on your pool’s overall health. In this article, we’ll explain what cyanuric acid is, what causes high levels, and how you can lower it to keep your pool in top condition.

What is Cyanuric Acid?

Cyanuric acid is a chemical compound that is added to swimming pools to protect chlorine from the sun’s ultraviolet (UV) rays. Chlorine is used as a sanitizer in pools to kill bacteria and algae, but UV rays can cause it to dissipate quickly.

Cyanuric acid helps to keep chlorine levels stable, so it can continue to do its job of keeping the water clean. However, it is important to maintain the right balance of cyanuric acid in the pool, as too much can lead to a host of problems.

Symptoms of High Cyanuric Acid Levels

One of the most obvious signs that your pool’s cyanuric acid level is too high is if the water appears cloudy or hazy. High levels of this chemical can also cause chlorine to lose its effectiveness as a sanitizer, meaning that bacteria and algae may start to grow in the water. Additionally, you may notice discoloration or staining on the surfaces of your pool.

Another issue with high cyanuric acid levels is that it can start to impact the pH balance of your pool. When this happens the pool water starts to become scaley, chlorine demand increases and the pool water’s alkalinity will decrease making it hard to maintain the pH balance.

What Causes High Levels of Cyanuric Acid?

The most common cause of high cyanuric acid levels is the overuse of stabilizers during the initial pool filling or maintenance. When you first fill a pool, it is typical to add a large amount of stabilizer to protect the chlorine from the sun’s UV rays. However, if too much is used, it can lead to high levels that are difficult to bring down.

Another possible cause of high cyanuric acid levels is a leakage in the pool’s circulation system. This can lead to water loss and an increase in the concentration of chemicals, including cyanuric acid. Improperly balanced water chemistry can also contribute to this problem.

How to Lower Cyanuric Acid Levels

There are several ways to lower the level of cyanuric acid in your pool, but the best method will depend on the specific circumstances of your pool. The most common and easiest method is dilution by partially draining and refilling the pool with fresh water. This will dilute the existing water, thus reducing the overall concentration of cyanuric acid.

Another way to lower cyanuric acid levels is by using a product specifically designed for this purpose. There are various chemical products available that can help to lower the levels quickly and effectively. You can find these products at your local pool supply store.

Another solution for the long-term is using a slow dissolving stabilizer in your pool, it will slowly dissolve over time which will prevent the need of adding too much stabilizer at once. This will help balance out the cyanuric acid levels in a slow and steady manner.

Preventing High Cyanuric Acid Levels

Once you have successfully lowered the cyanuric acid levels in your pool, it’s important to take steps to prevent the problem from recurring. One of the most important things you can do is to properly balance the water chemistry in your pool. This includes regularly testing the levels of chlorine, pH, and other chemicals, and making adjustments as needed to keep them within the recommended range.

Another way to prevent high cyanuric acid levels is to follow the manufacturer’s recommended guidelines for the use of a stabilizer. Be sure to only use the amount of stabilizer specified in the instructions, and don’t add more just because you think it will help.

Using a slow-dissolving stabilizer can also prevent the problem from recurring. Instead of adding all the stabilizers at once, which can cause cyanuric acid levels to spike, a slow-dissolving stabilizer will release the chemical into the water over time, helping to maintain a more consistent level.


Maintaining proper levels of cyanuric acid in your swimming pool is essential for keeping the water clean and safe for swimming. High levels of this chemical can cause a variety of problems, including cloudy water, reduced effectiveness of sanitizers, and discoloration or staining of pool surfaces.

By understanding the causes of high cyanuric acid levels, knowing how to lower them, and taking steps to prevent the problem from recurring, you can keep your pool in top condition for many years to come.

Remember, regular testing and proper water chemistry is the key to preventing high cyanuric acid levels and ensuring a happy and healthy swimming pool experience.