Question from Hyderabad, Andhra Pradesh : Can we reduce TDS by precipitation of dissolved salts or is RO a must?

I am residing near Kapra lake near Sainikpuri, Hyderabad. The bore water of our colony is taste's ok,  but leaves white residue in water heaters. The TDS tested by a pen like instrument by a water purifier sales man showed about 400. Can adding a little alum and precipitating the dissolved salts help me in using the water for drinking or getting an RO system is the only method?

Ram Mohan
vrm_vaddadi@yahoo.com

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