Usually RO membranes in ...

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Usually RO membranes in domestic units are not capable of handling TDS above 1000ppm. Only larger membranes are available for high TDS. 

For arsenic you can look for Activated Alumina cartridges and for TDS there is no other membrane filtration method for high TDS water.

Using solar distillation may not be practical as it cannot produce water in low sunlight. 

You should look for distillation units with electrical heating.