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What Does Cyanuric Acid (Stabiliser) in swimming Pools Do

What Does Cyanuric Acid (Stabiliser) in swimming Pools Do

Cyanuric acid is a vital component of any outdoor pool’s chemistry.

Although it is much less frequently discussed than other chemistry factors like your pool’s chlorine and pH levels, maintaining ideal levels of cyanuric acid in your pool is essential for keeping these other chemicals in balance.

In this in-depth guide to cyanuric acid, we will discuss what this acid is, how it is used in pools, and other names that you may see it referred to as.

There are a lot of different chemicals that are used to keep swimming pools clean and safe for people to use. One of those chemicals is called cyanuric acid, or stabiliser. But what exactly does this chemical do, and why is it important?

Cyanuric acid is a type of chemical that is used to stabilize chlorine in swimming pools. Chlorine is one of the most common chemicals used to kill bacteria and other microorganisms in swimming pools. However, it can be broken down by sunlight, which is a problem if you want to keep your pool clean and safe for a long period of time. This is where cyanuric acid comes in.

When cyanuric acid is added to a pool, it bonds with the chlorine molecules and helps to protect them from being broken down by sunlight. This means that the chlorine in the pool will last longer, and you won’t need to add as much of it to keep the pool clean.

But cyanuric acid does more than just stabilize chlorine. It also helps to prevent algae from growing in the pool. Algae can be a big problem in swimming pools, as it can make the water look green and unappealing. By adding cyanuric acid to the pool, you can help prevent algae from growing in the first place.

Another benefit of cyanuric acid is that it can help to save you money. By stabilizing the chlorine in the pool and preventing algae growth, you won’t need to use as much chlorine or other chemicals. This can help to save you money on pool maintenance over time.

However, it’s important to use cyanuric acid correctly. Too much of it can actually reduce the effectiveness of chlorine and make the pool less safe. It’s recommended to keep cyanuric acid levels between 30 and 50 parts per million (ppm) in outdoor pools, and between 10 and 30 ppm in indoor pools.

In conclusion, cyanuric acid is an important chemical for keeping swimming pools clean, safe, and appealing to use. By stabilizing chlorine and preventing algae growth, it can help to save you money on pool maintenance over time. Just be sure to use it correctly and keep the levels within the recommended range for the best results.

Swimming pools require regular maintenance and care to ensure they remain clean and safe for swimmers. One crucial aspect of maintaining a swimming pool is monitoring the levels of cyanuric acid, also known as stabiliser. Cyanuric acid plays an essential role in keeping the chlorine levels stable and preventing it from dissipating quickly due to sunlight. This article aims to delve into what cyanuric acid does in swimming pools and how to test the levels.

What does Cyanuric Acid do in Swimming Pools?

Cyanuric acid is a chemical compound that acts as a stabiliser in swimming pools. It helps to prolong the lifespan of chlorine in the water by shielding it from the sun’s UV rays, which can break down the chlorine quickly. Without cyanuric acid, pool owners would have to add chlorine more often, leading to higher costs.

Cyanuric acid also helps to maintain the pH level of the pool water, which is necessary for a comfortable swimming experience. This is because unstable pH levels can cause skin and eye irritation and damage pool equipment, leading to an increase in maintenance costs.

How to Test Cyanuric Acid Levels

Testing the cyanuric acid levels in your swimming pool is vital for ensuring its safety and longevity. Here are the steps to test the cyanuric acid levels in your pool:

Step One: Obtain a Cyanuric Acid Testing Kit

You can purchase a cyanuric acid testing kit at any pool supply store. These kits typically come with testing strips, a comparator, and a chart that helps you interpret the results.

Step Two: Collect a Sample of Pool Water

Using a clean plastic container, collect a sample of pool water from approximately one foot below the surface. Be sure to collect enough water to fill the testing vial.

Step Three: Test the Cyanuric Acid Levels

Dip the testing strip into the water sample and hold for the recommended time. Next, compare the strip’s color to that on the chart provided in the testing kit. The color of the strip corresponds to a specific cyanuric acid level in the water.

If the cyanuric acid levels in the pool are too high, it can reduce the effectiveness of the chlorine, leading to the growth of harmful bacteria and algae. On the other hand, low cyanuric acid levels could cause the chlorine to dissipate too quickly, leading to higher chlorine costs.

In conclusion, cyanuric acid plays a crucial role in maintaining clean and safe swimming pools.

Problems Caused by Low Cyanuric Acid Levels

Low cyanuric acid levels in pools can be problematic. Without the stabilizing effect of cyanuric acid, the chlorine in the pool will be weakened by the sun’s rays, which will require a lot more chlorine to maintain a safe level of sanitation in the pool.

In addition, low cyanuric acid levels can cause the pool to be vulnerable to bacteria and algae, as there will be inadequate protection against the sun’s UV rays. This can lead to cloudy and algae-filled water, which is not only unappealing but also poses health risks for swimmers.

Another problem caused by low cyanuric acid levels is that it can lead to an imbalanced pH level in the pool, making the water more acidic. This can cause skin irritation and other health issues for swimmers, as well as damage to the pool’s infrastructure.


In conclusion, cyanuric acid is an essential chemical in maintaining a healthy and safe swimming pool. It helps to stabilize chlorine, protects against UV rays, and reduces the amount of chlorine needed. Low cyanuric acid levels can cause various problems leading to bacterial growth, imbalanced pH levels, algae, skin irritation, and structural damage to the pool. Therefore, it is important to test the cyanuric acid levels in your pool regularly and maintain them at an appropriate level to ensure a clean and enjoyable swimming experience.

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