I'm not exactly sure of the ...

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I'm not exactly sure of the question? If it is about testing for hardness, the best source is Standard Methods for the Examination of Water and Wastewater.  Unfortunately it is an expensive book.  My guess is that one could go to Google and get an answer for free?

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National Green Tribunal of India does not recommend RO if water contains TDS < or= 500 ppm. TDS based recommendation for determining the need for RO is what is being contested. Example: If water contains Arsenic 18micro grams per litr, Chromium > 2 micro gramper litr and Strontium >7mg/litr, water becomes unfit for human consumption even if TDS does not exceed 500ppm necessitating using domestic RO unit.

UDayashankar

 

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The context here is the mini piped water supply schemes  (designed for population size 1000) and large number of deep bore wells spread in the rural areas and small towns. Preliminary understanding of water quality is possible with field testing kits (FTKs) . The objective here is to test a minimum number of safety parameters to understand if water is potable.

Water samples are being tested for total hardness. My question is if the measured value of total hardness is within the acceptable range then should we tests of Calcium and Magnesium?   

    

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