Check your cyanuric acid levels to make sure they are in the safe limits. Levels between 30 and 50 ppm (particles per million) tend to work well, although levels up to 80 ppm can be safe. There’s a lot of discussion around the most effective level of cyanuric acid to keep in your pool.
It could lead to corrosion or staining, but more importantly, it makes taking care of hot tub water much harder than it needs to be.Keep your cyanuric acid levels between 30 and 50 ppm. It causes problems with killing microorganisms by slowing down chlorine's kill times, which could potentially produce unsafe water. With no need for UV protection, CYA should not be in hot tubs. All disinfectants for hot tubs must be approved by the Environmental Protection Agency (EPA), and they must state the exact chemical ingredients and percentages on the label.
However, dichlor is also known as sodium dichloro isocyanurate, which clearly calls out the cyanuric acid content of this formula. Dichlor by Another Nameĭichlor is listed on its container labeling as sodium dichloro-striazinetrione with the added designator of either dihydrate or anhydrous. According to PK Data in the APSP 2018 Yearbook, 60% of all hot tubs are sanitized with chlorine, and the chlorine most often used and recommended is dichlor. The result is your TA may be lower than you think, which could result in corrosive water that is damaging to surfaces and unpleasant to soak in.Įven though the CDC and other scientific evidence says CYA should not be used in hot tubs, most hot tub owners use chlorine. 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."
DOES BLUEX CHOLOROX HAVE CYA FREE
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. While trichlor is still a popular choice for chlorinating swimming pools, most hot tubs are chlorinated with dichlor.
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