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TDS is lower then Total hardness

Is it possible, the total Hardness is higher then Total Dissolve Solids (TDS) of the same water.

Anwar Hossain
- Dhaka, Bangladesh
February 2, 2011

Hi, Anwar. If the two parameters use the same units I can't see how that is possible. Please put your question into context. If this a question on a homework assignment? Is a lab reporting such results? Thanks.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
Ted can be retained for immediate
answers or long term project help
February 2, 2011

It is not possible. However, if you are measuring the TDS with a TDS meter, the reading is probably incorrect because it actually measures conductivity, not TDS. The most accurate way to measure TDS is to evaporate a filtered sample to dryness and to weigh the residue.

Lyle Kirman
consultant - Cleveland Heights, Ohio
February 3, 2011

If the hardness is being reported in mg/l CaCO3, but is present as magnesium, the results you describe are possible.

Dave Wichern
Consultant - The Bronx, New York
February 13, 2011

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