1. If you use dichloro, trichloro or chlorine stabilizer, test water for Cyanuric Acid (CYA) and enter its value in the field Cyanuric acid (CYA)

2. Otherwise, enter '0' in this field

CYA is present in your pool when you use stabilized chlorine (trichloro, dichloro) or you add CYA (stabilizer) to reduce photodecomposition of non-stabilized chlorine types.

CYA contribute to Total Alkalinity (TA), but does not contribute to the water balance indicated by Langelier Saturation Index (LSI). The calculator correct the CYA effect on the TA to get the Carbonate Alkalinity (CA) used to calculate the LSI. Click Show Carbonate Alkalinity in the TA area to display the CA value in any condition