08/25/2026
💧 **A PLUS POOL FACT OF THE DAY** 💧
# # # 🧪 CYA: When Is It Too High?
**Cyanuric Acid (CYA)** is often called chlorine stabilizer or conditioner. Its job is important—it helps protect chlorine from being rapidly broken down by sunlight.
But when it comes to CYA, **more is not always better.**
☀️ **How does CYA get too high?**
Many stabilized chlorine products, including **trichlor tablets and dichlor shock**, add CYA to the water every time they're used. Chlorine gets consumed, but the CYA remains behind. Over time, the level can continue to build.
⚠️ **Why does high CYA matter?**
As CYA increases, a higher free-chlorine concentration is needed to maintain effective sanitation. If chlorine isn't adjusted accordingly, you may experience:
• Recurring algae
• Difficulty maintaining proper sanitation
• Increased chlorine requirements
• Water that looks clear but isn't being sanitized as effectively as it should be
💦 **Can you just add a chemical to lower CYA?**
In many situations, the most practical and predictable way to significantly reduce excessive CYA is to **replace a portion of the pool water with fresh water**. How much water should be replaced depends on the current CYA level, the desired level, and the pool's overall water chemistry.
⚠️ **Important:** Never drain a swimming pool without considering groundwater conditions, pool construction, weather, and the condition of the pool surface. A full drain is not always necessary—or advisable.
At **A Plus Swimming Pool Services, LLC**, we look at the complete water chemistry rather than treating one number by itself. Proper chlorine, CYA, pH, alkalinity, calcium hardness, temperature, and **LSI balance** all play a role in maintaining healthy water and protecting your pool.
📞 **281-731-7329**
Have you had your pool's **CYA level checked lately?**
