Saline Water Treatment at Household Level

We are working ​on the ​installation of ​hand pumps and ​we are faced ​with ​saline water ​with TDS over ​2000 ppm. ​ What is the ​low-cost ​solution for ​saline water ​treatment at ​household level?​ How can we ​reduce TDS and ​arsenic levels?​ ​ RO plants are ​not a ​sustainable ​solution due to ​maintenance ​since 80% of RO ​plants in ​this area ​are not working.​