Cyanuric acid is a white, odorless powder used as a stabilizer for chlorine in pools. It is also known as “pool conditioner” or “sunscreen” for your pool because it helps protect chlorine from the sun’s UV rays.

It is added to pool water to prevent chlorine loss due to sunlight. It works by forming a “shield” around chlorine molecules, thereby protecting them from the sun’s ultraviolet (UV) rays.

While cyanuric acid is important to maintain a pool, it’s important to use it correctly. If too much cyanuric acid is added to pool water, it can create problems. For example, high cyanuric acid levels can make it difficult for chlorine to work effectively, leading to cloudy water and algae growth.

This article will discuss cyanuric acid, how it works, and how to use it in your pool properly. Let’s get started.

What is Cyanuric Acid for Pools (CYA)?

Cyanuric acid is a chemical compound used as a disinfectant and algicide in swimming pools and hot tubs. It is also known as chlorine stabilizer. It works by slowing down the release of chlorine into the water, making it more effective at killing bacteria and algae.

Cyanuric acid is available in powder, tablet, or granular form. It is usually added to pool water through a skimmer basket or floating dispenser. The recommended dose of cyanuric acid varies depending on the size of the pool and the level of chlorine being used. However, too much cyanuric acid can cause problems such as cloudy water, scale buildup, and reduce the effectiveness of chlorine.

If you use cyanuric acid in your pool, it is important to test the levels regularly and adjust the dose accordingly. You should also avoid adding too much chlorine to the water, as this can cause the cyanuric acid to bind with it and form dangerous chemical compounds.

It is an important part of keeping your pool clean and safe for swimming. Following the recommended dosage and monitoring the levels regularly ensures that your pool is always ready for a refreshing dip.

What Are The Correct CYA Levels?

While CYA is necessary to maintain proper chlorine levels, too much of it can be detrimental to both your pool and your health. That’s why it’s important to keep an eye on your CYA levels and adjust them accordingly.

The ideal range for CYA levels is 30-50 ppm (parts per million). However, many experts believe that 40 ppm is the perfect sweet spot.

Anything below 30 ppm is considered too low, leading to rapid chlorine loss and increased algae growth.

On the other hand, levels above 50 ppm are generally considered too high. High CYA levels can make it difficult to maintain proper chlorine levels and cause skin and eye irritation.

The level of free chlorine in your pool should be 7.5% of the level of cyanuric acid present. For example, if there is 40ppm (parts per million) of cyanuric acid in the pool, then the free chlorine concentration should be 3ppm. Generally, the free chlorine levels in a pool should be between 1-3ppm.

What About Salt Water Pool?

The recommended cyanuric acid level for saltwater pools is 60-80 ppm. This is because the sun’s UV rays are much more harmful to saltwater than chlorine, making it necessary to maintain higher cyanuric acid levels. If you’re a saltwater pool owner, keep an eye on your cyanuric acid levels and make adjustments as needed.

Remember, too much cyanuric acid can lead to problems such as algae growth and cloudy water. The reason for this is that it reduces the effectiveness of your chlorine. With CYA levels at 100 ppm or more, getting an accurate reading from a test strip becomes difficult.

What Causes High Cyanuric Acid Levels in Pools?

High levels of cyanuric acid can be caused by several factors, including overuse of chemical products containing cyanuric acid, evaporated pool water, and rainfall. Also, high levels of cyanuric acid can result from using recycled or reclaimed water to fill the pool.

When these levels become too high, they can cause problems with the effectiveness of chlorine in killing bacteria and algae. In extreme cases, high cyanuric acid levels can even make outdoor pools unsafe for swimming.

When these products are used in excess, the cyanuric acid builds up in the swimming pool water and raises the level of acidity. This can lead to problems such as skin and eye irritation, as well as respiratory issues for swimmers.

How to Lower Cyanuric Acid (CYA) in Pool?

No products found.

If you own a pool, it’s important to be aware of cyanuric acid levels. Cyanuric acid is used as a swimming pool disinfectant and stabilizer and can build up over time. High cyanuric acid levels can make your pool water cloudy and cause skin and eye irritation. There are a few steps to lower cyanuric acid in your pool.

1. Test Your Pool Water

The first step is to test your pool water to see the cyanuric acid level. You can purchase a pool test kit at your local pool supply store. The normal range for cyanuric acid is 30-50 ppm. If your cyanuric acid levels are too high, you will need to take steps to lower them.

2. Stop Using Stabilized Chlorine

If you want to lower cyanuric acid levels in your pool, you first need to stop using stabilized chlorine. Stabilized chlorine contains cyanuric acid, which will only add to the problem. Instead, switch to unstabilized chlorine, such as liquid chlorine or calcium hypochlorite.

3. Drain and Refill Your Pool

One way to lower the cyanuric acid levels in your pool is to drain and refill it. This will help dilute cyanuric acid’s concentration, making it safer for swimming. Be sure to follow all local ordinances when draining your pool. After refilling your pool, you will also need to add fresh water and chemicals.

4. Dilute Your Pool Water

Diluting pool water is one of the most effective ways to lower cyanuric acid levels. By diluting the water, you will lower the cyanuric acid concentration, making it less potent. To do this, add more water to your pool. This will require you to top off your pool more often, but it will be worthwhile in the long run. Be sure to test your cyanuric acid levels after diluting your pool water to ensure they have lowered to a safe level.

5. Circulate and Retest Your Cyanuric Acid Levels

Once you have diluted your pool water, it is important to circulate it to ensure that the cyanuric acid is evenly distributed. You can run your pool filter for a few hours each day. After circulating the water, be sure to retest your cyanuric acid levels to ensure that they are at a safe level. If they are still too high, you may need to repeat steps 4 and 5 until your cyanuric acid levels are lowered to a safe level.

Does CYA Reducers Work?

The short answer is that CYA reducers can work very well to help you lower cyanuric acid levels in your pool. However, it’s important to understand how they work and use them properly, as they can pose some risks if not used correctly.

CYA reducers are chemical compounds that react with and break down cyanuric acid molecules into simpler compounds that are less likely to cause problems in your pool. This can help to lower the overall levels of CYA in the water, making it safer and easier to keep your pool clean and healthy.

However, it’s important to note that CYA reducers can cause problems if not properly used. In particular, if you use too much of a CYA reducer, it can cause cyanuric acid levels in your pool to drop too low. This can create several problems, including making your pool more susceptible to algae growth and making it harder to maintain proper chlorine levels.

Therefore, it’s important only to use CYA reducers as directed by the manufacturer or your pool professional. This will help ensure that you are using them safely and effectively and not putting your pool at risk by using too much or too little.

Also Read: How to Fix Hot Tub Foam?

How to Increase Cyanuric Acid in Your Pool?

If your pool is low on cyanuric acid, also known as a stabilizer, you can do a few things to increase the levels. The stabilizer is important because it protects your pool from the sun’s ultraviolet rays, which can cause fading and other damage.

Equipment You’ll Need:

  • Cyanuric acid
  • Water test kit
  • Protective Clothing


  1. Test the cyanuric acid levels in your pool using a water test kit. The ideal range is 30 to 50 parts per million (ppm).
  2. Then, add cyanuric acid to the pool according to the manufacturer’s directions. You can usually add it directly or dissolve it in a bucket of water and pour it into the pool.
  3. Retest the cyanuric acid levels after 24 hours to ensure you’ve added enough.
  4. Repeat steps 2 and 3 until the cyanuric acid levels are in the ideal range.
  5. If you’re still having trouble raising the cyanuric acid levels, you may need to drain and refill your pool.

Cyanuric acid is important in keeping your pool safe and protected from the sun’s rays. By following these simple steps, you can easily increase the cyanuric acid levels in your pool to keep it looking its best.

Does Pool Shock Contain Cyanuric Acid?

No, pool shock does not contain cyanuric acid. Cyanuric acid is a chemical compound used to stabilize chlorine in swimming pools. It is not necessary to add cyanuric acid to pool shock.

Pool shock is a concentrated form of chlorine that is used to sanitize swimming pools. It is available in both liquid and granular forms. Pool shock is typically used when the chlorine levels in a pool are low and need to be increased quickly.

Cyanuric acid can be added to pool water separately from pool shock. However, it is not necessary to do so. Cyanuric acid stabilizes chlorine in pool water and prevents it from being broken down by the sun’s ultraviolet rays.

Also Read: Pool Turned Hair Green And How To Fix It?


Is Cyanuric Acid The Same As Baking Soda?

Cyanuric acid is not the same as baking soda, although they are both used for cleaning. Baking soda is a stronger alkali than cyanuric acid and will, therefore, significantly affect pH levels.

How Harmful Is Cyanuric Acid?

Cyanuric acid is relatively safe, but it should be handled with care. The chemical can cause skin and eye irritation, so it is important to wear gloves and goggles when working with it. Inhaling cyanuric acid dust can also irritate the respiratory system, so working in a well-ventilated area is important.

How Often Do You Add Cyanuric Acid To Pool?

Cyanuric acid should be added to pool water regularly, as it helps maintain the pH level and prevent algae growth. However, it is important not to overdo it, as too much cyanuric acid can make the water murky and difficult to see.

Do Chlorine Tablets Have Cyanuric Acid?

Yes, chlorine tablets usually contain cyanuric acid, which helps to stabilize the chlorine so that it can work effectively for longer periods. However, too much cyanuric acid can reduce the effectiveness of chlorine, so it is important to use the two products in moderation.

Also Read: How Long To Run Pool Pump?


To summarize, cyanuric acid is an important chemical in pool care. It helps protect against UV rays and keeps chlorine working properly. Too much cyanuric acid can lead to problems, so it’s important to test levels regularly and adjust as needed. With the right amount of cyanuric acid, your pool will be protected and look great all season long.

We hope this article helped you better understand cyanuric acid and how it benefits your pool.

Last Updated: November 20, 2022 / Categories: Outdoor & Garden, Pool & Spa / 9.9 min read / Tags: , , /

About the Author: Brian Stilts

Brian Stilts

Homepeer is reader-supported. We may earn a commission through products purchased using links on this page. Learn more about our process here.

Subscribe To Receive The Latest News

Add notice about your Privacy Policy here.