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Drinking Water TDS level fit for consumption - Varanasi, Uttar Pradesh

I am a resident of Varanasi. I get my water supply through the tanker from teh society, which lands in a sump and then pumped to an overhead tank
TDS level is about 350-400 PPM. We have a female baby of 4 months.
We have installed a low TDS membrane RO system, which has reduced the TDS level by 45% to 170-180 ppm
Please suggest if we need to go for the 90% (high) membrane which would reduce the TDS to 40 PPM.
I would like to know when UV + RO is required?
As per my knowledge. RO plant usually drains out all the micro organism from water and reduces the TDS too, then why do we require UV?
Thanks & Best Regards

Ankit Singh



1. Water treatment

The TDS level even at existing levels is fine so you need not worry.

What you need to check is for EXCESS Nitrates in the water. Please get a sample of water checked in a good laboratory for BIS 10500 norms.

On that basis of the report  be sure to ask the laboratory as to what they recommend for water treatment or place it here on the website for advice.

The current system seems OK but UV treatment is good for micro-biological contaminants too.

You need not change the current system.


2. Dear Ankit Singh, Your water

Dear Ankit Singh,
Your water is fit for drinking from the TDS point of view. No treatment for TDS is necessary.  RO system is expensive as well as there is wastage of water during treatment along with high electricity consumption. Others will go for some low cost purification system, if required.

With regards

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


Dear Ankit,

I have already given you the answer through e-mail.As per the figures given by you your water falls in the category of good quality water however if you are interested in installing the water treatment filter than you should go for UV treatment only. As commented by zenrainman, if possible kindly get the water tested for nitrates as if water with excess nitrates i.e. more than 45mg/l is consumed by infants it may prove fatal to them due to Blue Baby Disease.If Nitrate are found in excess than you should go for R.O. filter with facility of TDS controler knob.

kindly feel free to contact if further guidance is required.


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

4. Dear Ankit, Feel quite

Dear Ankit,
Feel quite sympathetic for you. You SHOULD NOT look for reducing the TDS when it is not required as are your case seemingly from the TDS level you have mentioned! To me you are wasting your money on a treatment system which is not required at all (at least for this level of TDS). A TDS level upto 500 mg/l is fine as per Indian standards for drinking water (BIS 10500). Infact one requires some amount of salts and hence anything below 40 mg/l may actually create an adverse impact.
I suggest you get your water tested for its quality from a recognized laboratory and based on its complete profile get an expert advise on the kind of treatment required IF AT ALL. As i said in this case you don't need any treatment.
To answer your query on RO & UV, RO may be required treating/reducing high TDS water (something beyond 800 or 1000 mg/l) and it may not necessarily treat the bacteriological contamination. For bacteriological contamination usually disinfection methods are used of which UV treatment is one.
Let me know if you are finding it difficult to understand anything or any other help you might need.
Best wishes
Associate Fellow
Water Resources Policy and Management
Water Resources Division
The Energy and Resources Institute (TERI)
New Delhi

5. Dear Ankit, You are right of

Dear Ankit,
You are right of course. RO does drain out bacteria & reduces TDS too. However, domestic membranes are low pressure type and therefore their pore sizes allow some bacteria. In addition to that, there is no backwash system or anti-scalant system to ensure against membrane fouling. As a result, over a period of time, membranes allow some TDS and bacteria to slip by. UV helps at that point. The TDS of 120-180 ppm is good for drinking. Lower TDS is not good for your or the baby's health. Industrial RO membranes are the correct ones for reduction of TDS and microbes very effectively. The domestic membranes are a stop gap plan suited for individual households. Hope you have understood the reasons by now.
With regards,
Taral Kumar
Executive Director
Akar Impex Pvt. Ltd.
Noida, Uttar Pradesh

6. water RO

I have placed at raibareli can you suggest me that is their any requirement of RO system or not.

7. Bore water turns brown after storage

I am living in Gerugambakkam (near to Porur) in Chennai for past 11/2 years.

We are residing in an apartment, having a family of 5 .

Intaillly  the builder provided  bore well of 70 to 80 feet approx.. At that time we found the water turned slight yellow colour after some time and also was smelling of sewage. Then he provided an open well of about 40 feet. It had clear water but still we observed the sewage smell.

Finally he provide a bore of 120 feet. The water coming from that bore is clear and the same changed to muddy water after storage in the tank.


8. Safe Drinking water

Dear All,

I want to know the standard for safe drinking water, i.e. TDS, PH etc. and where I can test it.

Please reply.

Thanks & Regards,

Basudeb Dey, Vapi, Gujarat


9. TDS around 580-600 - Do I have to go in for RO?

I live in Kolkata and the TDS level of my water is around 580-600. I have bought a normal water purifier without RO system and one iron and arsenic guard. The purifier company suggested us to not take the RO system because for our TDS level RO is not required.

Is is safe for us or we should go for RO system?

10. If we reduce borewell depth will we get water with low TDS?

I want to know if I reduce the bore well depth, will I get water with less TDS?

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