From the CDC: In case of a fecal incident, close the pool, and CYA levels can no longer exceed 15ppm.

Another 45 minutes, another half of your chlorine is gone. 0000006516 00000 n 0000154807 00000 n We know the Nitrogen-chlorine (N-Cl) bond is weak because the chlorine attached still shows up in a free chlorine test. Can you sustain that? chlorine stabilizers (like CYA) slow the rate that free chlorine kills pathogens. 0000000816 00000 n At 7.5 pH, half the chlorine is strong HOCl, and the other half is weak OCl-. Another very important thing to understand about CYA is its impact on the Langelier Saturation Index (LSI). Cyanuric acid is kind of like sunscreen for chlorine. ; Suppes, L.M. We have heard numerous first-hand stories of draining high cyanuric acid pools. Cyanuric acid (CYA) is well known in the pool business. Let’s get real here. ORP stands for oxidation reduction potential. The half-life of chlorine—when exposed to direct sunlight—is about 45 minutes. 0000003538 00000 n

It looks like this: TA ppm - (CYA ppm x [CYA correction factor @ pH of the water]) = Carbonate Alkalinity, TA ppm - (CYA ppm ÷ 3) = Carbonate Alkalinity. While this site attempts to provide information that may be relevant to you, no guarantees are made that some relevant information will not be missed. Most commonly, however, cyanuric acid is found in stabilized chlorines dichlor and trichlor. So let’s put this formula into the real world. When it lets go, it’s active free available chlorine, but vulnerable to sunlight. The cyanuric acid molecule is a hexagon with alternating Nitrogen and Carbon atoms. 2019, 11, 1314.
Sometimes it takes additional calibration of the controller and sensors to get things operating right. If you’re treating outdoor commercial pools, keeping CYA under 15ppm is really hard to do. 298 0 obj<>stream

But do you know of any neighborhood summer pools that can get through their entire season without a single fecal incident? 0000055933 00000 n

For the most part, CYA levels can remain very stable if you’re not adding more of it to the water. Why? There are some products that can reduce CYA as well, but like any chemistry, there are reactions for every action. Sources suggest it takes about 10ppm CYA to protect 1 to 1.5ppm FAC, but we have not yet found a definitive answer on that. Cyanuric acid is available as a granular solid and as a liquid (sodium cyanurate). 273 26 ; Meyer, E.M.; Pickens, S.R. When water evaporates, CYA stays behind and stays in the water for a long, long time. It can deposit itself on the pool surface as the water drains, and wait to be reabsorbed when refilled. CYA just gets in the way. The last example shows us how trichlor pools tend to be more aggressive–not only because of trichlor's low pH, but because of accumulated CYA's severe impact on the LSI. The Sun’s ultraviolet rays degrade chlorine very quickly, creating a problem for outdoor pools. On the right chart, the percentage of HOCl plummets to about 3%, meaning about 97% of chlorine is bound to CYA as an isocyanurate. Commercially produced melamine may contain structural analogues, such as cyanuric acid, ammelide and ammeline. We did some research. The takeaway: Cyanuric acid can most certainly be beneficial. Understanding CYA is a cornerstone of what we teach, and there is a growing body of research available online1. So on and so forth. Studies show that sunlight can be wipe out chlorine by 75-90% in a matter of two hours. When it needs to leave the raft to oxidize or kill a germ, chlorine simply lets go of the raft…and another chlorine molecule will take it’s place and grab the raft. 273 0 obj <> endobj 0000006269 00000 n x��U�OSW��>�/L�T��fA�E ��.�U[\��4��ƅ��X����tF�a�Q�* �Ui�1���7#N3�SG��i�-˶hB���sN��vC��~���}|>�p/ ��/ 0000003806 00000 n Additionally, with enzymes, chlorine levels can be minimal while maintaining a strong ORP. It serves as a protection shield for chlorine against sunlight. Just remember to test CYA levels monthly, adjust your total alkalinity reading when using CYA, and do not feed “stabilized chlorine” products when your CYA levels exceed 50 ppm. 0000002334 00000 n 0000007392 00000 n Not only does chlorine have to overcome the oxidant demand before sanitization can happen, there is approximately a 7.5% chlorine reduction factor with cyanuric acid against algae. Without adding anything to the pool yet—besides tap water—the CYA level was 30ppm the next morning. Just input your pH, measured total alkalinity and CYA, and all of this equation is factored in automatically. © Copyright 2020, Pure Planet Science & Technology, Inc. CE-Clarifier: Chitosan Clarifier + Enzyme, Calculadora de Dosis para Albercas de Orenda, sunlight can be wipe out chlorine by 75-90%, The Chlorine/CYA Relationship and Implications for Nitrogen Trichloride, oxidant demand before sanitization can happen, reduce cyanuric acid is to drain the pool. Don't worry though, the Orenda App's LSI Calculator takes care of all of this math for you. 0000219127 00000 n We won’t get into the weeds on the chemistry, but if you would like to learn more, we encourage you to research how to lower cyanuric acid levels. As a result, ORP may be lower, even if free chlorine remains the same.