What is CYA?
Why CYA Levels Matter: Protecting Your Pool the Smart Way
If you're a pool owner, you're likely familiar with chlorine—your pool’s main line of defense against algae, bacteria, and other contaminants. But did you know that chlorine doesn’t work alone? One of its most important allies is a chemical called cyanuric acid, commonly known as CYA, or Stabilizer. Understanding and maintaining proper CYA levels is critical to keeping your pool safe, clean, and efficient all season long.
CYA is vitally important to the water chemistry in your pool
What is CYA?
CYA, or cyanuric acid, is a stabilizer or conditioner for chlorine. It acts like sunscreen for your chlorine, protecting it from being broken down too quickly by the sun’s UV rays. Without it, chlorine can dissipate in a matter of hours—leaving your pool vulnerable to contamination.
Why the Right Range Matters
While CYA is essential, more doesn’t mean better. In fact, too much cyanuric acid can be just as problematic as too little.
Low CYA levels (< 30 ppm): Your chlorine burns off too fast under the sun, leading to ineffective sanitization and frequent chlorine additions.
High CYA levels (> 70-100 ppm): Chlorine becomes less effective at killing bacteria and algae. Even if your test kit says you have enough chlorine, it won’t be doing its job properly.
Ideal range: For outdoor pools, the recommended CYA level is typically between 30 and 50 ppm. If you have a saltwater pool, a slightly higher range of 60–80 ppm may be acceptable.
The Dangers of Ignoring CYA
Neglecting to monitor and adjust your CYA levels can lead to:
Algae blooms
Cloudy or unsafe water
Excessive chlorine use (and cost)
The need for partial draining if levels get too high
Tips for Maintaining Proper CYA Levels
Here are a few practical steps to keep your pool’s CYA levels in the recommended range:
1. Test Monthly (At Minimum):
CYA levels don’t fluctuate as frequently as chlorine, but it’s still important to check at least once a month—more often in hot climates or with heavy pool use.
2. Know Your Products:
If you're using stabilized chlorine like trichlor or dichlor, you’re also adding CYA every time you sanitize. Consider switching to unstabilized chlorine (like liquid chlorine or cal-hypo) if your CYA is creeping up.
3. Avoid Overdosing When Adding CYA:
When adding cyanuric acid, do so gradually and retest before adding more. It's much easier to add than to remove!
4. Perform Partial Drains If Needed:
If your CYA gets too high, the most effective solution is to partially drain and refill the pool with fresh water to dilute the concentration.
5. Work With a Professional:
A trained technician can help you maintain a proper chemical balance and provide guidance on long-term water management strategies.
Need Help With Your Pool Water Chemistry?
At Sunrise Pool & Spa, we’re passionate about pool care that’s simple, smart, and stress-free. Our trained technicians take the guesswork out of water chemistry and help you maintain balanced, healthy water all season long.
Call us today to schedule a service visit or water analysis!