Need to reduce the TDS of water from 1500 ppm to 500 ppm for fish farming and pearl farming

I have a pond in Murthal, Sonipat district and my borewell water parameters shows 1530 ppm of TDS and 6.2 - pH. I want to reduce the TDS level upto 500 - 700 ppm for fish farming and pearl farming. The TDS level of water in this area has increased significantly in the past few years and I am looking for a solution to counter this situation. Also need suggestion, if this water treatment affects the growth of live stocks in any way. Appreciate for the suggestions and solutions.