RO standards

Most UV water purifiers in the market say they are only suitable for water with TDS<200 mg/l. Otherwise, these companies recommend RO. Is there any health-basis to the 200 mg/l threshold, given that WHO says water with TDS below 500 is palatable? more  

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Marketing .... Marketing .... Marketing .... Has anyone checked the TDS at input and output of the Water Filter (RO or Otherwise) ? The quantum of TDS is not the issue, its the nature of the TDS ... and none of the filters actually address that ... more  
It is the duty of the govt./municipality to supply water with known TDS and carry out complete analysis as a routine job....??? more  
By encouraging more and more fine tuned Water Filter, we are reducing Immunity Capacity of Individual, which is not good in long run. more  
TDS has no relationship to Bacteria and merely represents the total amount of dissolved solids in water more  
Ok....but it must be blocking the effect of UV on germs when it is more than 200....that is the question... more  
Need to understand if more TDS means more germs in city must have been tested in some lab....not merely a case of standard....but RO should be avoided to keep some useful minerals minus the germs.... more  
When I purchased TDS meter for checking the value in our supply line, happened to check the TDS value for RO water of my neighbour's, found it to be only 3-5 ppm, then i checked TDS of my other neighbours which was 40 - 50 ppm, at that time I was not aware of TDS value in RO water because i was not using one, informed my first neighbour to get it checked Most of the people are not aware of the correct functioning of RO systems, and the RO mechanic is least bothered for this, since they are interested only in their payments and most of them, uneducated, never realize the potential hazard of this I have been using my normal UV water purifier since long in Delhi, without any health problems RO supplying companies never test the water supply in your home, to know, if at all RO is required for your water or not more  
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