Hi Moorthy, It depends on the ...

Hi Moorthy, It depends on the actual ions making up the TDS.  It sounds as if their water is hard (has a high calcium and magnesium content).  During the treatment process the water should be stabilised (i.e. ensure the Langelier index is correct to give a pHs that is just slightly over-saturated). This is done  through the use of lime and/or carbon dioxide or another acid.  If the water is from a borehole with no prior treatment, they can test the hardness and if necessary adjust the pH to make it less scale forming.  Using plastic pipes also helps to reduce scaling, or regular flushes with an acidic water.  If the clogging is from gypsum scale (calcium sulphate), this is more difficult to prevent and may require either a reduction in the calcium or the sulphate levels.  Best wishes in dealing with this.