APR-13 APR-14 APR-15 APR-16 APR-17 APR-18 APR-19
ELS Zone (1)              
Total Hardness (mg/L as CaCO3) (2) 156 148 148 148 148 154 --
pH (pH) (3) 7.7 7.7 7.7 7.7 7.8 7.8 7.8
Temperature (°C) -- -- -- -- -- -- --
Total Chlorine Residual (mg/L) (4) 1.91 1.92 2.03 1.94 1.95 1.93 1.91
Alkalinity (mg/L as CaCO3) (5) 107 100 100 105 105 107 109
Conductivity (µS/cm) (6) 382 388 312 382 381 387 388
Caustic Soda (mg/L) (7) 18.9 22.3 16.9 20.3 21.2 19.7 17.7