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Chlorine Monitoring - Recommended Methods?

We plan to setup automated chlorination plant for drinking water in our factory. The dosing pumps are available in the market. We need to monitor the Residual Chlorine in the sump. So we are planning for the same

We would like to know from the experts:

1) Primarily regarding the availability & operational ease of the chlorine monitoring devices in India.

2) Reliability of Amperometric (Electrode based) chlorine analysers.


Kindly share your experiences and also advice regarding the best possible method that can be selected to ensure reliable and cost effective action.

Thank you.

Jay Savant



1. Dear Jay Savant,1. Reply:

Dear Jay Savant,

1. Reply: Chlorine monitoring devices are imported by various sources. The ideal monitoring device shall be sourced from someone who makes the metering systems in India. You may try Toshniwal Industrial Syndicate who have a tie up with Jesco. They are at Ajmer and have an office in Kalkaji, Delhi. They have complete solution as well as the devices. I know them to be reliable and competent.
2. Reply: As i have said earlier, the systems are imported or assembled in India. It is not a good idea to deal with a party that has limited information on the same. You may try Toshniwal as they have been doing this for years and are a specialist in chlorination-liquid or gaseous. They have a tie up with Jesco, Germany.Dear User,



Taral Kumar
Executive Director
Akar Impex Pvt. Ltd.
Noida, Uttar Pradesh

2. Monitoring residual chlorine in drinking water.

Dear Mr.Savant,

You are asking for the best method for monitoring residual chlorine in water used for drinking.What is the quantity of drinking water that will be consumed at your factory daily?

Amperic electronic instruments can do the monitoring effectively, but such methods are most suitable where there is a steady flow rate and volume is sizeable.What is the source of water used for drinking and what methods of purification are used?This will determine method of chlorination and hence monitoring.As you yourself have pointed out,chlorine metering systems are available in the country.Instruments to monitor the residual chlorine are also available.If the volume/flow rate are not high, testing kits could be used instead of on-line instruments.Once you start the process of chlorination with electronic metering pumps, it will be possible to set the optimum dosage needed to maintain the minimum necessary chlorin residual.

Chorination is no more the favoured method of disinfection of water because chlorine is known to combine with certain chemical/organic compounds in wate to form compounds which are carcinogenic.Ultra Violet light is one of the fovoured methods of disinfecting drinking water and there are several manufacturers of UV equipments in the country already.Ozone is also being used increasingly for this purpose nowadays.

If I get some answers to  questions I have asked above, I will be in a position to advise you suitably.





3. Chlorination Question

Hi Mr. Savant,

Regarding the comment that chlorination is no longer the perferred method of disinfection, one needs to understand their system to see if chlorination, chloramination, UV, or chlorine dioxide will work.  Determine what is in the raw water, if you have issues with parasites such as cryptosporidium and giardia, you should shoot for 4 log treatment and use UV, Chlorine dioxide, since these organisms are resistant to chlorine.  Also, disinfection byproducts are caused when chlorine reacts with naturally occurring organic matter to form these DBPS called total trihalomethanes and haloacetic acids.  In addition, water age from water in storage tanks not being turned over can cause DBP issues along with warm temperatures and distribution system pipes with lots of biofilm.  Perform some jar tests to see what would be the effective dose that would be required to maintain the residual you want.


4. Chlorine Monitoring

Hi Mr. Jay Savant,

As mentioned above Chlorine is not prefered disinfectant because of its carcinogen effect, a know health hazard. Again it also has environment issues. New food safety law will be soon implemented in India where all the hazardus chemicals for sanitation/disinfectant will be banned from use.

Stabilised Chlorine Dioxcide is the best solution for the water treatment. It removes Biofilms and gives 5 log reduction. It kills Bacteria/virus/fungus/algae and most difficult spores forming organisms. This is 3.6 times powerful than chlorine and with no hazardus tag with it. Its action is from seconds to minutes and effective over wide temperature range Ph range of 4-10. It maintains taste and controls odor in the water.  Using chlorine dioxide will help optimize overall treatment efficiencies, including improved coagulation, reduced turbidities, improved particulate removals, increased CT values and lower THMs and HAAs.

With Regards

Hiren Pancholi


5. Chlori check meters

Dear Sir,

We have a number of Chlorine meters which can give result in ppm levels in about two minutes. These meters are extremely handy and any person can operate them. They are battery operated and quite sturdy. Plus they are imported. You can go for test kits too.

6. Chloricheck meters

Dear Sir,

I need information about availability of chlorine dioxide ppm checking machine. If you are dealing with this product, please do contact.

Hiren Pancholi, 09371061789

7. Very slow reaction of chlorine gas with Paraffin oil ( C.P.Prod)

During the processing of chlorinated paraffin the chlorine gas in not reacting at normal rate, it reacts very slow & suddenly material becomes either black or yellow. We feel some there is some impurity of sulphur mist with others in chlorine source. Please advice any practical solution to this problem.

8. Conact us for slow chlorination product

Dear Raj Kumar Verma,

Lemmox stabilised oxochlorine solution is in both liquid and gaseous form. Its reaction is very fast and is safe to use. It is pure and there is no chance for any foreign material in the formulation. Kindly contact for further details.

Hiren Pancholi

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