FROG® @ease® Sanitizing System for Swim Spas
No Cyanuric Acid (CYA): The Facts
The Center for Disease Control recommends not using cyanuric acid or products containing CYA in hot tubs or spas.
According to an article on Healthy Water from the CDC, they make a bold statement that “The CDC recommends not using cyanuric acid or chlorine products with cyanuric acid in hot tubs/spas.”
Dichlor is about 50% cyanuric acid by weight.
Dichlor is a stabilized chlorine commonly used in hot tubs. The problem is hot tubs don’t need to be stabilized. They are not out in the direct sun all day like pools so they don’t need the UV protection that the cyanuric acid in dichlor offers.
High CYA levels disrupt chlorine’s ability to sanitize water.
According to J.R. Anderson in his article “A Study of the Influence of Cyanuric Acid on the Bactericidal Effectiveness of Chlorine” it takes 4 times as long to kill common hot tub bacteria when CYA is at 50 ppm and 6 times longer when CYA is 100 ppm.
At 50 ppm of CYA, it takes 4X longer to kill bacteria.
Multiple sources, including the CDC, recommend eliminating Cyanuric Acid (CYA) from hot tubs. Yet many hot tub owners use chlorine containing CYA resulting in cloudy, smelly water in as little as a few weeks.
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CYA FREE Solution!
CYA Educational Resources
Swim Spas are categorized as portable spas. Educational resources listed below apply to both hot tubs and swim spas.
Centers for Disease Control and Prevention (CDC)
https://www.cdc.gov/healthywater/swimming/residential/disinfection-testing.html
CYA: Ally For Pools – Havoc for Hot Tubs
https://www.kingtechnology.com/images/AQ11-SC.pdf
Taylor Technologies stating “Both dichlor and trichlor are over 50% CYA by weight”
https://www.taylortechnologies.com/en/page/171/why-monitor-cyanuric-acid
National Center for Biotechnology Information Support Center (NCBI)
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1256554/pdf/amjphnation00162-0123.pdf
Pool and Spa News about CYA
https://www.poolspanews.com/how-to/maintenance/what-to-know-about-cyanuric-acid_o
Pennsylvania Department of Health
https://www.health.pa.gov/topics/Documents/Programs/Operations-SOPRecommendations.pdf
Scientific papers
http://www.poolhelp.com/wp-content/uploads/2017/05/JSPSI_V2N1_pp34-41.pdf
https://pdfs.semanticscholar.org/45df/ab9228ad91446771722ca6a850eb8696f928.pdf
https://pdfs.semanticscholar.org/ba9b/4a37526b0a50b10586efef263ee144b3a143.pdf