| Variable | Dialysis Units (n = 30) | Normal reference | ||||
| Unit 1 | Unit 2 | Unit 3 | Unit 4 | Unit 5 | ||
| Cl− | Nil | Nil | Nil | Nil | Nil | ≤0.2 mg/L |
| Chloramine | Nil | Nil | Nil | Nil | Nil | ≤0.1 mg/L |
| NH3 | Nil | Nil | Nil | Nil | Nil | Nil |
| No2 | Nil | Nil | Nil | Nil | Nil | Nil |
| NO3 | Nil | Nil | Nil | Nil | Nil | Nil |
| F | Nil | Nil | Nil | Nil | Nil | ≤0.2 mg/L |
| SO4 | 12 | 3 | 4.8 | 4 | 14 | ≤100 mg/L |
| Na+ | 4.6 | 0.8 | 1.6 | 1.8 | 5.8 | ≤70 mg/L |
| K+ | .05 | Nil | Nil | Nil | .20 | ≤5 mg/L |
| Ca2+ | Nil | Nil | Nil | Nil | Nil | ≤5 mg/L |
| Mg2+ | Nil | Nil | Nil | Nil | Nil | ≤4 mg/L |
| Conductivity (Us/cm) | 49 | 14 | 18 | 16 | 54 | ≤300 Us/cm |
| TDS | 31 | 9 | 11 | 10 | 34 | ≤200 mg/L |