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- Saline water conversion 71
- Technology 47
- Water quality 33
- Building 24
- Economics 20
- Hydrology 18
- Reverse osmosis 17
- Irrigation 12
- Water--Purification--Distillation process 9
- Groundwater 8
- Sewage 8
- Agriculture 7
- Finance 7
- Industries 7
- Electrodialysis 6
- Brackish waters 5
- Dams 5
- Pipelines 5
- Politics and government 5
- Water-supply 5