What Should Be The Ideal TDS Count In Reverse Osmosis Water Purification System To Make Water Drinkable?

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TDS in water isn't one the the critical attributes that determine if a water is drinkable.  If the TDS is high it can be safe but many people think it is unpleasant (cosmetic attribute).     From the U.S. EPA website: 

National Secondary Drinking Water Regulations

  National Secondary Drinking Water Regulations (NSDWRs or secondary standards) are non-enforceable guidelines regulating contaminants that may cause cosmetic effects (such as skin or tooth discoloration) or aesthetic effects (such as taste, odor, or color) in drinking water. EPA recommends secondary standards to water systems but does not require systems to comply. However, states may choose to adopt them as enforceable standards.   
List of National Secondary Drinking Water Regulations
          Contaminant   
Secondary Standard
    Aluminum   
0.05 to 0.2 mg/L
    Chloride   
250 mg/L
    Color   
15 (color units)
    Copper   
1.0 mg/L
    Corrosivity   
noncorrosive
    Fluoride   
2.0 mg/L
    Foaming Agents   
0.5 mg/L
    Iron   
0.3 mg/L
    Manganese   
0.05 mg/L
    Odor   
3 threshold odor number
    pH   
6.5-8.5
    Silver   
0.10 mg/L
    Sulfate   
250 mg/L
    Total Dissolved Solids   
500 mg/L
    Zinc   
5 mg/L


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