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- Saline water conversion 162
- Technology 92
- Water quality 59
- Economics 54
- Irrigation 39
- Hydrology 37
- Agriculture 35
- Groundwater 32
- Building 30
- Politics and government 27
- Reverse osmosis 26
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- Aquifers 18
- Sewage 16
- Resource allocation 15
- Water-supply 15
- Demography 13
- Water--Purification--Distillation process 13
- Industries 12
- Water consumption 12