Important Notice About High Cyanuric Acid Levels and Water Balance

This message is for all customers who receive a High Cyanuric Acid (Stabilizer) Notice.

Over time, the continued use of chlorine tablets steadily increases the stabilizer level in pool water. When the stabilizer (Cyanuric Acid) becomes too high, chlorine loses its effectiveness — a condition known as chlorine lock. Even though chlorine readings may appear high, it can no longer sanitize the water properly.

When this happens, pools are prone to algae growth, cloudy water, and unstable chemical readings. The only way to lower Cyanuric Acid is by replacing some of the pool water with fresh water.

Industry Standard for Water Replacement

According to current pool industry standards (including APSP and NPC guidelines), residential pools in Texas should have 10–20% of their water replaced every 6 months, or a minimum of 30–50% annually, to maintain proper chemical balance.
This helps control Cyanuric Acid, Calcium Hardness, and Total Dissolved Solids — all of which naturally build up in Texas pools due to high evaporation and refill rates from hard municipal water.

Ongoing Maintenance and Responsibility

For customers choosing not to drain, Dragoo Services will continue to manage pH, alkalinity, and phosphate levels to minimize algae and maintain safe balance. However, please note:

⚠️ Due to excessive stabilizer levels, Dragoo Services cannot be held responsible for algae formation or water chemistry instability resulting from these conditions.

If you drain your pool, and since you provide the chlorine, you can transition from chlorine tablets to liquid chlorine if you choose, this change would help prevent stabilizer buildup and keep your water chemistry within recommended limits.

Thank you for your continued trust in Dragoo Services Pool Maintenance. Our goal is to keep your pool as clear, safe, and enjoyable as possible within the chemistry limits of your current water.

— Dragoo Services