your sample contains lots of salts (Na, SO4, etc). it's very hard to remove those using simple methods

it water very hard , toy dont using for irrigation if it purification 

Kindly see here..Best

http://www.tandfonline.com/doi/abs/10.1080/10934529709376649

Please check this also..Best

http://tcbanana.blogspot.in/2011/05/irrigation.html

More info on EC..

http://agsource.crinet.com/page2582/ManagingSalineSoilIrrigationWaterQuality

Check this too..

http://www.dpi.nsw.gov.au/land-and-water/soils/salinity/salinity-and-crops/saline-irrigation

It may also help you..

http://www.hydroponics.com.au/how-do-i-manage-ec-electrical-conductivity/

May also useful for you..

http://cotton.tamu.edu/Irrigation/IrrigationwithSalineWater.pdf

Electrical conductivity of water can be decreased by Reverse Osmosis process. Thus pH may also be adjusted to require level.