Now, if you’re living in an area that’s going through a drought or has placed water restrictions on residents, perhaps draining your pool (or even a portion of your pool) is not an option. If this article provided some value, make sure to subscribe to our newsletter to be updated when more articles get published. Water. It stays in your water for a long time. As you can see, cyanuric acid is very useful but can be a double-edged sword, both increasing chlorine’s lifespan and decreasing its disinfecting power in your pool. To keep water safe, sanitation is critical, and it needs to be practical. What is Cyanuric Acid (CYA)? With your CYA of 110 ppm, your SLAM level FC is 40 ppm. Most … It is safe to swim in the pool. As you know, it takes a lot of chemicals and a perfect balance to ensure your pool is crystal clear and safe for swimming. Another relatively misunderstood consequence of CYA is its impact on your water’s overall balance. This is because the LSI formula requires a CYA correction against, total alkalinity to find the carbonate alkalinity, All you need to know is the higher your CYA, the lower your LSI. You just need to add a bit more and you’re good to go. If you are using a stabilized chlorine like trichlor or dichlor, CYA accumulates...fast. Even if you add the right amount of cyanuric acid, you need to test for it regularly. This combination forms stable chlorine, which comes as a colorless solid. I’m sure they have their reasons for this but since cyanuric acid dissolves super slowly, it really does make more sense to use the bucket method. Cyanuric acid is a chemical compound in the triazine family, which basically means that its chemical makeup includes three nitrogens and three carbon atoms. In addition, there is a clear correlation between increased levels of cyanuric acid and the time it takes to effectively kill bacteria present in pool water. Once you add chlorine to your pool, the big yellow thing in the sky goes to work burning off the chlorine through chemical reactions, seriously decreasing the power of the chlorine in your pool water. And yet, we encounter many people that are hesitant to drain—or even dilute—their pool to … What can you do if your CYA levels are already high? The lowest concentration that WHO recommends is 50 ppm, however, keeping … Let me introduce you to the newest weapon in your pool care arsenal: cyanuric acid. The problem with cyanuric acid being too high is that is can block chlorine from killing bacteria. Most complete pool test kits come with a test for cyanuric acid but you can also get separate tests or test strips to check your levels. What does CYA do? A free chlorine level of about 8 would be right for that level of cyanuric acid, if I'm remembering correctly. Now that we know that cyanuric acid stays in your pool water for a long time and doesn’t get used up the way chlorine does, testing often is super important. Test the Water. It dissolves slowly in water and has hardly any effect on a pool’s pH. The cyanuric acid extends the life of the chlorine by shielding it from ultraviolet rays. The increased lifespan of chlorine means it’s weaker than it was before. That's why Minimal CYA is Orenda's Fourth Pillar of Proactive Pool Care. This little miracle worker is going to be your best friend to protect your precious chlorine and keep your pool clean and sparkling all summer long. Significant draining has risks and should only be done by a pool professional, so dilution over time is often the best option. If your CYA is too high, draining and diluting is the most cost effective means to reduce CYA in your pool. You could also do a partial drain of the pool and refill to … High levels of Cyanuric Acid (CYA) in pool water can cause issues. It prevents chlorine from being burned off by the sun. Remember, more cyanuric acid doesn’t mean more protection, it will actually just decrease your chlorine’s efficacy. 2019, 11, 1314. The CDC regulates CYA levels. Chemically speaking, sodium dichlor is made up of one cyanuric acid molecule with two chlorine atoms and one sodium atom. At CYA levels over 80, a partial drain/refill to lower the CYA level is usually required before you start the SLAM. The cyanuric acid isn’t the issue here. The problem is not stabilization of chlorine, it's, The CDC's Regulation on Cyanuric Acid: 15 ppm, Avoid Over-Stabilization: Guest Blog by Dr. Ellen Meyer. See Figure 2, showing how much more free available chlorine you need–with raised levels of CYA–to obtain similar levels of Hypochlorous Acid (HOCl): Figure 2: Chlorine-CYA Chemistry 101, by Richard Falk. Don’t forget, however, that draining and refilling your pool means you’ll have to test and balance your chemicals again. With too little cyanuric acid, your chlorine disappears quickly. Pool is 24' AG, water depth is 3.5 feet, sand filter, 2.5HP two-speed pump (left running on low 24/7). When you add cyanuric acid to your pool, it binds to the free chlorine floating around to form a compound that’s stable in sunlight. Can CYA levels be reduced in a pool? And it never leaves residue that affects swimmers or plumbing. Stabiliser is the generic name given to the use of cyanuric acid (also known as iso-cyanuric acid) or its chlorinated compounds of sodium dichloro-isocyanurate and trichloro-isocyanuric acid. Is it safe to swim in a pool with high cyanuric acid? It is recommended that all information from this or any other source is to be performed assuming individuals performing these functions will consult local state and federal requirements before you act upon it in any way. The rain will introduce a substantial amount of fresh water to your pool, which may dilute the concentration of cyanuric acid. CYA can be very beneficial up to a point, but becomes increasingly detrimental to the pool beyond that. If you have an outdoor pool, there’s no getting around it: you’re going to need cyanuric acid to protect your pool from chlorine loss. Because unlike chlorine, it doesn’t degrade and continues building up. Cyanuric Acid is a very important chemical in the swimming pool business. If you add too much, the chlorine loses all effectiveness and you’ve just wasted money on two chemicals. As water evaporates, CYA stays behind, just like calcium and salt. Just 15 ppm. It’s complicated (but the Orenda App does all the math for you). Just 15 ppm. Often described as “sun-block” for chlorine, cyanuric acid (CYA) is most commonly found in 3-inch chlorine tablets used in maintaining swimming pools. However, it’s the amount  of cyanuric acid in your pool that could cause problems. The problem is the high level of stabilizer will inactivate your free chlorine and leave your pool unsanitized. Absolutely. Figure 1 below illustrates this: Figure 1: The relationship of chlorine’s “staying power” and CYA, Figure 1 shows us that roughly 20-30 ppm of CYA is enough to give us 95-98% protection from sunlight in the first hour, assuming this chart is accurate. It’s a miracle worker in many ways, allowing you to manage your pool’s chemistry with minimal effort. That upper CYA limit? Yes, the most economical way to lower CYA is to partially drain and dilute the pool with fresh water. It is safe to swim in if you keep chlorine levels higher than normal. If your CYA levels are too high, first check to see if you are using a stabilized chlorine product that already has CYA in it. With me so far? However, it’s the amount of cyanuric acid in your pool that could cause problems. Test the Water. Granted, more CYA can give your chlorine more protection from sunlight for longer, but at what cost? This chemical compound is called triazine and is composed of 3 carbon and 3 nitrogen atoms. An exception might be if there is a heavy rain storm through which your pool is left uncovered. © Copyright 2020, Pure Planet Science & Technology, Inc. CE-Clarifier: Chitosan Clarifier + Enzyme, Calculadora de Dosis para Albercas de Orenda, Minimal CYA is Orenda's Fourth Pillar of Proactive Pool Care, protects chlorine from degradation from the ultraviolet (UV) rays of the sun, nitrogen compounds that chlorine still has to oxidize, Chlorine-CYA Chemistry 101, by Richard Falk, try to manage the pool with high levels of CYA, Assessing the Impact of Cyanuric Acid on Bather’s Risk of Gastrointestinal Illness at Swimming Pools. For that, let’s look at the work of the US Centers for Disease Control (CDC) and their research on CYA.1. And you might be surprised at just how impactful CYA is when using the Orenda App LSI calculator. Significant draining has risks and should only be done by a pool professional, so dilution over time is often the best option. Neither of those two options are as easy or affordable as replacing water with fresh water. Usually, elevated levels of CYA are just a consequence of habits. Active free chlorine in your swimming pool is one of the most crucial elements to making sure your water is safe from dangerous viruses, bacteria, and microorganisms. If your levels are too high, on the other hand, it’s a bit more tricky to solve. Studies show that direct sunlight can decrease chlorine levels by up to 90 percent in two hours. We’ll discuss that in a bit. Sometimes high CYA happens without realizing it. And not just that, but the summer heat that warms your water can also be a breeding ground for bacteria, which also uses up chlorine more quickly. Regarding chlorine’s ability to prevent algae, the Free Chlorine to Cyanuric Acid (FC:CYA) ratio is what matters, not just free chlorine. Usually, elevated levels of CYA are just a consequence of habits. But wait! Well, that’s the easy one. That upper CYA limit? It seems like stabilized chlorine use is the main reason for high levels of CYA. Pools that contain little or no cyanuric acid are going to eat through chlorine like crazy, especially if your pool is in direct sunlight for any portion of the day. As water evaporates, CYA stays behind, just like calcium and salt. Without it, the ultraviolet rays from the sun would break apart the chlorite ions, allowing the chlorine to just evaporate into thin air. This chart basically shows that more CYA in your water means you need significantly more chlorine to have the same sanitization power. If levels rise above this point, a portion of the pool water must be removed and fresh water added; there are no other means of diminishing the cyanuric acid … However, it is a problem with hot tubs. It shields these cleaning molecules from ultraviolet destruction, extending the lifespan of the chlorine you just added. Perhaps there are valid reasons—costs, structural risks, labor, environmental concerns—for not draining high CYA pool water. Referring back to Richard Falk, one of the committee members for the CMAHC, you need at least 7.5% of your CYA level in Free Chlorine to keep up with algae growth. This process usually involves dissolving some granules in a bucket and pouring it around the edges of your pool. Just look at how much chlorine (and acid to re-balance pH) is required to achieve the desired sanitation result. And you might be surprised at just how impactful CYA is when using the, Yes, the most economical way to lower CYA is to partially, It really just comes down to cost and risk. It slows chlorine dramatically, which lowers ORP. If you make the switch and find CYA is still a bit too high, allow some splashout and evaporation, then top off your pool with fresh water to dilute the CYA levels. – Cyanuric Acid is a chlorine stabilizer for swimming pools. . Sometimes you may feel like an alchemist mixing potions in a pool-size cauldron. The recommended level is 20‐50 ppm; levels over 100 ppm will not be accepted. Your CYA level won't go down through evaporation. Assessing the Impact of Cyanuric Acid on Bather’s Risk of Gastrointestinal Illness at Swimming Pools. See Figure 2, showing how much more free available chlorine you need–with raised levels of CYA–to obtain similar levels of Hypochlorous Acid (HOCl): If you have read the Orenda Blog, you already know our opinion of CYA is that it is a double-edged sword. It’s all the same stuff. For example, trichlor adds CYA every time you use it. As the high level of cyanuric acid reduces the amount of free chlorine and thus decreases the sanitization level of the pool. And yet, we encounter many people that are hesitant to drain—or even dilute—their pool to reduce CYA levels. 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