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- Saline water conversion 76
- Technology 51
- Water quality 35
- Building 26
- Economics 22
- Hydrology 19
- Reverse osmosis 18
- Irrigation 14
- Water--Purification--Distillation process 10
- Groundwater 9
- Agriculture 8
- Sewage 8
- Brackish waters 7
- Electrodialysis 7
- Finance 7
- Industries 7
- Dams 5
- Pipelines 5
- Politics and government 5
- Water consumption 5