![]() To do that, you subtract about 1/3 of the CYA reading from the total alkalinity reading. When working with the Langelier Saturation Index on balancing water, you have to account for the CYA level. High levels of CYA have also been known to cause corrosion because it is part of the total alkalinity of the water. The Pennsylvania Department of Health in December 2016 published a statement: "At even moderate levels of cyanuric acid, the amount of time it takes chlorine to kill pseudomonas aeruginosa (the bacteria that causes hot tub itch) can be as much as 100 times as long as in a hot tub or spa without cyanuric acid." This appeared in the publication "Public Swimming and Bathing Places: Operational and Biological Protocol Recommendations." This makes the free chlorine level a moving target.ĬYA buildup and the increase in kill times has led the CDC to issue this statement: "The CDC recommends not using cyanuric acid or chlorine products with cyanuric acid in hot tubs/spas." This was published in May 2016 in a CDC article called "Your Disinfection Team: Chlorine & pH." So, as the CYA increases, you need to make a corresponding increase in the free chlorine level. To achieve the same kill time would require a much greater chlorine level in the water. As CYA increases the effectiveness of the chlorine decreases. It is 1 minute and 30 seconds with 50 ppm CYA and nearly 2 minutes with 100 ppm CYA. The kill time (CT value) for pseudomonas aeruginosa, which is the organism associated with hot tub rash or itch, with no CYA is about 20 seconds. More times of use or more people would require more chlorine and have a larger increase in CYA. Bottom line is that two people using the hot tub two times a week will consume 14 ppm chlorine and increase the CYA by 12.6 ppm per week. Another way to look at it is that each person per hour in the hot tub will consume 4 grams of pure chlorine or 8 grams of dichlor, which is 3.5 ppm of chlorine in a 300-gallon hot tub. In other words, a 300-gallon hot tub adding 1 1/2 teaspoons of dichlor four times a week can build up a CYA level of 50 ppm in as few as four weeks and reach 100 ppm CYA in only seven weeks. This means that for each 10 ppm of chlorine added to the water from dichlor, the CYA increase is 9 ppm. If you need additional help, Contact Us for advice on maintaining a balanced pool.While trichlor is still a popular choice for chlorinating swimming pools, most hot tubs are chlorinated with dichlor. Download the free Clorox® Pool app for expert water analysis results and personalized dosage recommendations. Using pool water test strips is an easy, accurate way to test your water poolside. Always maintain Free Chlorine between 1-4 ppm and Stabilizer of at least 30 – 50 ppm. Regardless of the type of sanitizer, pool owners should test their pool water at least one per week. Pool owners choosing to use chlorinating liquid as their sanitization product may need to add stabilizer separately to help their chlorine last longer. These multifunctional products reduce the number of steps pool owners need to take to maintain their swimming pools.Īlternatively, chlorinating liquid products typically do not contain the beneficial CYA often found in tablets or granules. Many solid chlorinating products, like granules or tablets, are developed to include CYA. In the pool industry, Cyanuric Acid is known as chlorine stabilizer or pool conditioner. The longer chlorine is present in pool water, the longer it’s available to kill bacteria and sanitize the water. Adding Cyanuric Acid reduces the sun’s impact on chlorine loss. Chlorine, in its natural form, is unstabilized-which means it degrades when exposed to sunlight. ![]() ![]() Cyanuric Acid (CYA) is a pool balancing product used to help chlorine last longer.
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