Cyanuric Acid: The Most Misunderstood Chemical in Pools

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Rudy dives headfirst into cyanuric acid — CYA, stabilizer, conditioner — the most misquoted, weaponized, and argued-about chemical in the pool industry. He breaks down what the science actually says about HOCl in stabilized water, why that old HOCl / OCl⁻ chart belongs in a museum, how CYA really impacts ORP, TA, and LSI, and why “chlorine lock” is less supernatural curse and more “you nuked the stabilizer and fed the biofilm.”

Between the chemistry deep dive, Rudy hits the global pool-industry newswire: PHTA’s APSP-11 rewrite, bromate and sodium bromide drama, media consolidation across major trade mags, massive international trade show attendance, European trends in energy-efficient builds, Australian code delays, and South American market movement. If you’re running a pool business in 2025, this episode hits both your test kit and your bottom line.

In This Episode

• CYA: Not the Villain, Not the Hero, Just Misunderstood
  Why cyanuric acid became “chlorine’s sunscreen,” how chlorinated cyanurates actually work, and why CYA got popular in the first place — because it works, not because a committee was bored in the ’60s.
• Why the Classic HOCl Chart is Garbage in Stabilized Pools
  
• Real HOCl Percentages at Common CYA Levels
  
• Copper Cyanurate Stains & “Prom Night Blue” Plaster
  
• CYA, Total Alkalinity & LSI: The Secret Sabotage
  
• ORP Suppression & Why Stabilized Pools Read “Low”
  
• Chlorine Lock is a Myth
  
• The Holy Sh*t Zone: CYA at 300 ppm and Up
  
• Alum Method to Lower CYA – How to Do It Right
  
• Fecal Incidents, CYA, and the Law (CDC Crypto Protocols)
  
• Does CYA Really Buffer pH? The Honest Answer
  
• Best-Practice CYA Targets
  

Global Trade Magazine News Roundup

Rudy also runs through the week’s biggest stories from around the world:

• PHTA’s APSP-11 Water Quality Standard Rewrite
  
• Record Global Attendance at the 2025 PSP/Deck Expo in Vegas
  
• Pool & Spa News – Top 50 Service Survey
  
• AQUA Magazine’s 50th Anniversary Preview
  
• Service Industry News – United Chemical Bromate Study
  
• Kenilworth Media’s Big Acquisition Move
  
• EuroSpaPoolNews – Barcelona & Germany Specials
  
• SPLASH! Magazine – NCC 2025 Delay in Australia
  
• Brazil – Revista da Piscina & Pool Life
  

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