its not suitable for ...

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its not suitable for irrigation. For irrigation, TDS around 2000 mg/l is fine.

Here you need to reduce TDS to this level to use. USe SWRO membrane and it will bring down to this. But yes it will be costly.

If you want to reduce the cost, you can mix less TDS water with this one and try to bring TDS below 8000 mg/l. And after that, use BWRO membrane. 

This way, you will get high recovery also.