Need details about water softening plant for a society of 1000 flats - Groundwater very hard and salty with a high TDS

Dear Sir,

I am living in a society of 1000 flats and we are using ground water which is hard and salty with very high TDS, unfit for drinking.
I need to know the viability of water softening plant so that the water in the area becomes sweet.

I think our bore is really deep. Is there a possibility of changing the water by lifting the water pumps as the sweet water is lighter than the salty water?

Please advice.
Regards,

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