| RO | reverse osmosis |
| ROLU | reverse osmosis lab unit |
| cf | concentration factor |
| REACH | Registration, Evaluation, Authorization of Chemicals |
| Cr(III) | trivalent chromium ions |
| Cr(VI) | hexavalent chromium ions |
| ICP-OES | inductively coupled plasma atomic emission spectroscopy |
| intelWATT | Intelligent Water Treatment Technologies |
| rejection value | |
| permeance | |
| permeate flux | |
| hydraulic pressure |
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