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RO Troubleshooting - Test Report Attached!

Please find attached the water test report concerning the bore water from our village. Our village does not have access to pure drinking water and with a view to providing the same a trust was formed. The current method of purification using a R.O. plant and "hyrdronautics cpa2 40-40 membranes" is not suitable for consumption. Kindly advice on what methods can be adopted to improve the water quality and make it acceptable to all the users.

Suggestions may also be provided to make sure that the remedy is economically feasible.        
        Thanks & Regards,

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Raw water test report.xls14.5 KB


1. R.O. troubleshooting



Your water sample is very rich in dissolved minerals. I feel that if it is used as community water supply, alternative source would be the right option (preferably surface source). If rainfall is can support drinking water requirement in your area, RWHS may be used at household level. Mizoram sets a good example in RWH.

Treatment of water from existing source may be troublesome and expensive.

Before using R.O., pretreatment may be required. Preferably water softning process may be adopted.

Fluoride content is also more than permissible limit (greater than 1.5 mg/l). Defluoridation is required.

If TDS is around 2000mg/l, R.O. may show good results. However, it is expensive.

I am attaching a typical table of treatment options used in community water supply system. This might help you. However, once again I recommend for alternative source.

Click here to access: State Water Treatment

with regards

Diponkar Bordoloi

2. Dear Sasidhar, According to

Dear Sasidhar, According to the test report of the water fed to the RO plant. 1. The analysis of the water shows the water to be extremely poor quality considering that it has a TDS level of nearly 7000ppm.Water of such a poor quality will need special RO membranes since the "Hydronautics CPA2" membranes can only purify water with TDS levels of approximately up to 3000ppm. 2. I need details of the RO plant such as the capacity of the High Pressure pump, configuration of the pressure tube, number of membranes, etc to advise on whether the plant can be modified or needs to be completely re-placed. Regards S.S. Ranganathan Advisor Ion Exchange Bangalore

3. Dear Sasidhar,   Apparently,

Dear Sasidhar,


Apparently, the water sample analysis report is for the raw water which is unsuitable for drinking. To my mind, RO (i.e, reverse osmosis) should be suitable but if the suppliers of this technology advice that the membrane available for supply is not suitable, an alternative will have to be considered. The obvious alternative is distillation which will be more expensive and there may be problem in finding small units with distillation technique.

A totally alternative approach will be to collect, store and disinfect rain water which may be used for drinking and cooking and the naturally available water may be used for other purposes.


With regards  


Paritosh Tyagi

Chairman (Retired)

Central Pollution Control Board

New Delhi

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