100−300mo/L Chromium: 100−500mg L Sulphide 100-300 \mathrm{mo} / \mathrm{L} \text { Chromium: } 100-500 \mathrm{mg} \text { L Sulphide }100−300mo/L Chromium: 100−500mg L Sulphide
100−300mg/L Chromium; 200−500mg/L Sulphide 100-300 \mathrm{mg} / \mathrm{L} \text { Chromium; } 200-500 \mathrm{mg} / \mathrm{L} \text { Sulphide }100−300mg/L Chromium; 200−500mg/L Sulphide
100−400mg/L Chromium; 200−400mg/L Sulphide 100-400 \mathrm{mg} / \mathrm{L} \text { Chromium; } 200-400 \mathrm{mg} / \mathrm{L} \text { Sulphide }100−400mg/L Chromium; 200−400mg/L Sulphide
100−500mg/L Chromium; 200−800mg/L Sulphide 100-500 \mathrm{mg} / \mathrm{L} \text { Chromium; } 200-800 \mathrm{mg} / \mathrm{L} \text { Sulphide }100−500mg/L Chromium; 200−800mg/L Sulphide
None of them \text { None of them } None of them