What is the maximum level of cyanuric acid often allowed by local health codes?

The maximum level of cyanuric acid often allowed by local health codes is typically set at 100 parts per million (ppm) because this concentration provides effective protection against the degradation of chlorine from sunlight without overly inhibiting its sanitizing ability. Cyanuric acid acts as a stabilizer for chlorine, helping to maintain its residual effectiveness in outdoor pools where ultraviolet (UV) rays from the sun can break down chlorine rapidly. While a higher level of cyanuric acid can enhance the chlorine's effectiveness in preventing rapid loss, excessive amounts can lead to potential issues, including reduced chlorine efficacy in maintaining proper water sanitation and clarity.

It's important to note that while some health codes may vary and state different thresholds, 100 ppm is generally recognized within the pool and spa industry as a safe upper limit. This limits the risk of overwhelming the system, ensuring both effective sanitation and swimmer safety.