I think you can use these ...

I think you can use these methods. 1. Converting saline water to fresh water using micro algae. 2-Use of carbon Nano tubes 3- Electro dialysis (ED), evaporation and distillation, reverse osmosis (RO), sand filter (used to reduce the grain size of water solutes to 50 microns), charcoal or activated carbon filter (to remove grease, taste, color, turbidity and Also removes chlorine from water) and ultra-filtration. 4- Desalination of saline water by capacitive deionization method. 5- Use proper filters on the pond floor Such as washed coarse grains, activated carbon filters, garnets, anionic and cationic resins, use of calcium sulfate or gypsum. 6- The effect of common ions 7- Electric shocks and nanotechnology (by paddy husk and almond shell)

I think you can use these methods. 1. Converting saline water to fresh water using micro algae. 2-Use of carbon Nano tubes 3- Electro dialysis (ED), evaporation and distillation, reverse osmosis (RO), sand filter (used to reduce the grain size of water solutes to 50 microns), charcoal or activated carbon filter (to remove grease, taste, color, turbidity and Also removes chlorine from water) and ultra-filtration. 4- Desalination of saline water by capacitive deionization method. 5- Use proper filters on the pond floor Such as washed coarse grains, activated carbon filters, garnets, anionic and cationic resins, use of calcium sulfate or gypsum. 6- The effect of common ions 7- Electric shocks and nanotechnology (by paddy husk and almond shell)