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Water Quality Concern : Quantification of Calcium oxalate, methods? Test Report provided - Bhopal.

We have borewell water at home in Bhopal. The water has been tested and the report is as follows:

1. Conductivity   -    708
2. TDS              -     345  mg/lit
3. Total Hardness-   255   mg/lit
4. Chloride         -    47mg/lit
5. Turbidity        - 0.5 npu
6. Sulphate       - 37 mg/lit
7. Flouride        - 0.44 mg/lit 
Is the water safe for use? Also, I have a query regarding the possibility if Calcium Oxalate can be tested in water by any method. This is for prevention of formation of kidney stones, do the above details above give any indication?

G G Subhedar,




Dear G G Subhedar,

The sample, you have mentioned, seems to be safe for those parameters. However, you have not mentioned the unit of conductivity. Generally around 70% of the results may be attributed to the dissolved chemicals as a thumb rule. Unit for conductivity is micro seimens/cm.

I do not have any idea regarding calcium oxalate (calcium combining with oxalic acid). There must be some technology for identification of that.
Kindly let me know regarding supplementary information.

With regards,

Diponkar Bordoloi
Assistant Engineer
Public Health and Engineering Department (PHED)
Guwahati, Assam


Dear G G Subhedar,

The analysis of sample of water should also include a bacteriological test to say that it is fit for drinking. In other respects, the water is suitable for drinking.

As for calcium oxalates, there may be no test because calcium oxalate is an insoluble compound. Oxalates of sodium and ammonia are soluble but I have not come across a situation in which they need to be tested. Guava is a rich source of oxalates. Excretion of oxalate and formation of stones is a matter of individual's metabolism.

With regards,

Paritosh Tyagi
Chairman (Retired)
Central Pollution Control Board
New Delhi


Dear Subhedar ji,

The test results provided by you shows that this water is fit for human consumption.As per my opinion consuming this water would not result in formation of stones as TDS and Hardness of water is not so high and is within the desirable limits of 500 & 300 mg/l respectively. further I have not gone through any test method for calcium oxalate.



Amit Kr. Singh,
Govt. of Haryana,
Public Health Engg. Department,
Water Testing Lab,Karnal-132001(haryana)


Dear Mr.Subhedar,

The analysis report figures shown in your question shows that the water conforms to BIS-10500 which is the Indian Standard for water used for human consumption.Since you have not given any results for bacteriological analysis,it would be best for you to use a purification device such as PUREIT which is capable of filtration and disinfection if bacteria is present.If you do not want to buy any purification device, the minimum necessary treatment for drinking would be to boil the water.

About Calcium Oxalate,it would be best to ask the lab which analysed the water if they can test for the presence of this substance.




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