Cyanuric acid protects the freely available chlorine against UV rays in outdoor pools. The desired value of cyanuric acid is 20 to max. 80mg/L. If this value is too low, you may raise it (if no ioniser is fitted) by adding stabilised chlorine, such as Starline chlorine tabs 90%, or Starline super granulate 63%.
If the value reaches its upper limit of 100mg/L, all the freely available chlorine in the water will be removed. This means that the freely available chlorine loses its effectiveness. To prevent this, adequate backwashing is required. Advice: on average 1x per week at least 2.5 minutes (depending on pump and filter capacity).
If you require further information, then contact our Starline sales team.