JUL-05 JUL-06 JUL-07 JUL-08 JUL-09 JUL-10 JUL-11
ELS Zone (1)              
Total Hardness (mg/L as CaCO3) (2) 197 185 174 173 174 174 172
pH (pH) (3) 7.8 7.8 7.9 7.9 7.9 7.9 7.7
Temperature (°C) -- -- -- -- -- -- --
Total Chlorine Residual (mg/L) (4) 2.17 2.18 2.13 2.15 2.14 2.16 2.15
Alkalinity (mg/L as CaCO3) (5) 118 114 114 116 119 119 118
Conductivity (µS/cm) (6) 549 526 495 468 463 450 440
Caustic Soda (mg/L) (7) 49.1 48.1 37.0 32.4 31.4 25.6 22.9