Cyanuric Acid (CYA), also known as "conditioner" or "stabilizer" is found in most chlorine products. It provides a type of "protective coating" for the chlorine to keep the sun from destroying the chlorine before it has a chance at doing its job. A good range is 30-50ppm.
Any product that contains Di-chlor or Tri-chlor contains CYA, which includes chlorine tablets, chlorine shock powder, and chlorine granules.
If your pool ever has a water replacement, you will more than likely need to add CYA back into your water.

Your pool technician regularly checks for CYA, and if your levels are low, you will be notified.
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