| A | Cross-sectional area |
| Cp | Concentration of TDS in the permeate |
| EC | Electric conductivity |
| EDI | Electrodialysis |
| EIEX | Electrodesionization |
| F% | The percentage of fouling |
| HRM | The hydraulic resistance of the membra |
| IEX | Ion exchange |
| IEXR | Ion exchange resins |
| IP% | Ion’s permeation percentage |
| IR% | Ion’s rejection percentage |
| Jp | Permeate flux density |
| Lp | Hydraulic permeability coefficient |
| LDH | Layered double hydroxides |
| ∆P | Pressure difference |
| PTM | Transmembrane pressure |
| Qa | Feed flow |
| Qp | Permeate flow |
| R% | Percentage of water recovery |
| RO | Inverse osmosis |
| SDI | Fouling index of the membrane |
| SEM | Scanning electron microscope |
| SHMP | Sodium hexametaphosphate |
| SP% | Salts permeation percentage |
| SR% | Salts rejection percentage |
| SS | Suspended solids |
| TDS | Total dissolved solids |
| TS | Total solids |
| TSS | Total suspended solids |
| t15 min | Operation time to fill 25 mL |
| ti | Initial operation time |
| T | Time elapsed between initial and second measurement. |
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