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Borewell Water Treated by RO - Troubleshooting for System!

Dear Sir/Madam,

I am from Machilipatnam, AP. I have a house of 12 flats, we use bore water for all our household activities (Bathing, washing etc) . The Tank capacity is around 6000 ltrs. However our bore water color got changed(odor less). We changed the location of the borewell couple of times, after 15-20 days of usage the water turns into reddish and greenish color.

We approached a local RO plant installer and asked for solution. He suggested water filteration method by passing through 2 cylider like containers (each 110 ltr capacity), one filled with activated carbon and another with sand and iron(it is like iron ore). We still have color in the water. I am here with attaching the results from the testing done by our local district water board. Can you please suggest what has to be done to remove color and other impurities, so that we can safely use this water for household activities.

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Water Test samples before and after filteration.xls18.5 KB


1. Treated by RO - Troubleshooting for System!

Dear Venulanka,

Your problem is iron oxide that is getting formed due to to the iron present in your groundwater being exposed to oxygen in the air.,

 you could read this articles to better understand what is happening with your water.

You need to have the filtration of water carried out after it has been stored in the tank for a couple of days, it will not help otherwise, or one could even opt for an ion exchange resin system to be incorporated online before the tank so that Fe2 in water is removed before it gets exposed to oxygen in the tank.

Apart from iron, you do have nitrate in one of your borewell water sample that could be an indicator of surface contamination

Hope this helps..



Dr. Anil Lalwani

2. Treated by RO - Troubleshooting for System!

Dear Venulanka,

The article below gives you various treatments that need to be done for iron removal based on the kind of ironpresent in your water

All the best

Dr. Anil Lalwani

3. This water has 3.3 ppm iron

This water has 3.3 ppm iron which is 10 times of allowed limit. TDS is 3000 ppm, which is six times of allowed limit. Iron and manganese are primarily responsible for change of water colour after water is exposed to air. Iron and manganese get converted in oxides and produce red and green colour.

1) Aeration of water required for converting iron and manganese into oxides.

2) Pass this water through sand filter.

3) You require to install UF and RO filters to lower the TDS to 500 ppm.


4. Dear Venu,You need to also

Dear Venu,

You need to also check up on Copper and Manganese contents. Does our piping system have copper pipes (if yes, are they corroding?).

Better is to contact Lanxess India who maybe able to provide a better solution in Ion exchange if the coloration is due to certain minerals and not impurities. They have an office in Chennai at 749, Anna Salai and Tel: 91-44-28420165

I am quite certain that they would provide you the best solution.


Keshav Agarwal
Technical Consultant
CTO - Biotech Services
Noida, UP

5. Dear Venu, I too would point

Dear Venu,

I too would point out that the problem is due to high iron content in water which needs a more extensive treatment with aeration and pH correction to precipitate the iron followed by pressure sand filtration and then carbon filtration.The next problem is high TDS levels of 3060ppm which will make the RO plant an expensive proposition. I would suggest that 'venulanka' get a detailed test report done on his bore well in the current practice of testing for all parameters as required for BIS-10500 as that could give more clues on selecting a more effective treatment.


Water Management Consultant
Ion Exchange

6. Dear Friend, The problem is

Dear Friend,
The problem is presence of Iron in water. The water has high salinity and high chlorides. I can understand the reddish tinge in water after a few days. the greenish tinge may be due to algal growth in the temperature and organics in water.
Treatment method suggested by the supplier is not effective unless you have aeration of the water first. The alternative and more workable method is to have an on-line iron removal filter followed by chlorination (liquid hypochlorite) which will oxidise the iron so it can be removed by pressure sand filter and activated carbon filter. That is the only method which will work. Go for an on line iron removal filter then on-line chlorination by metering pump followed by the 2 filters as described and another micron filter of 100 microns or less. You shall then have water which shall be clear. Make sure the filters are steel filters internally epoxy lined (not the bitumen paint but proper epoxy after sand blasting). FRP filters do not filter that effectively since you cannot fit the collection or distribution strainers properly. Avoid FRP filters, use MSEP filters with proper headers inside the vessel.
With best regards,
Taral Kumar
Executive Director
Akar Impex Pvt. Ltd.
Noida, Uttar Pradesh

7. Change in taste of borewell water


The problem is that the taste of borewell water has change significantly for the past 30 days. But our neighbor's borewell water remains the same. My borewell is around 5years old and has depth of around 500 feet. Please suggest a solution.

8. Tested borewell water-not suitable for drinking

Dear Sir

My home is located at Mailardevpally Village, Rajendra Nagar, Hyderabad. Our house was under construction and we dug a borewell 3 years back for water requirements of construction and used same water for construction. Now our house is ready, we shifted in this new house.

There is no tap water supply from Government till now in this area. So we have to use same borewell water for daily use. In October 2011 we got tested borewell water from Vision Lab, they say this water is not suitable for drinking.
I seek advice and suggestions from the experts for below questions:
    1) We can use this water for dish Washing?
    2) We can use this water for Cooking?
    3) We can use this water for Bathing?
    4) We can use this water for washing Clothes?
One of my friends told me to RO the water before use. What is RO? How much this will cost?  Water required for 6 persons daily use.
Kindly help me to resolve my water problem.

Thanking You.

Mohammed Rizwan

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