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How to keep your water tank cool in summer

Updated on April 16, 2016
Water tank painted
Water tank painted | Source

It has really been hard for us, particularly in summer but in winter as well, to use the water from the water tank installed on the roof. The water tank is made of fiberglass and the water stored inside turns so hot at noon in the summer season that it is hard to touch. Temperature in my area during summer reaches 47 degree Celsius. We used to fill the tank in the morning and by noon; it turned too hot to touch. One way to deal with that was to drain the hot water in the evening and fill it again with fresh water. However, this way, much water was wasted. During winter, the temperature touches 0 degrees in December and January and we had to face the same problem. We don’t drain the water in winter but excessive use of water heater is common at that time. The water stored in the tank reaches 4-5 degrees Celsius during night. Kids are always reluctant to take a shower in the morning before going to school. I searched a lot on the internet to find some solution of the problem but couldn’t find something practical. Last week, I met a friend who is M.Sc. in chemistry and discussed the matter with him. He mentioned a simple procedure about how to keep the water tank cool in summer. It is very simple to do, economical as well as much effective. I am sure many can benefit from that.

The solution was so simple that I didn’t believe it when I heard but it really did wonders for us after we applied it. Here is some simple explanation of the details how anyone who has this problem can benefit from this.

The materials required are not too many. It only required:

  • 3-4 kilogram of fine powdered calcium carbonate
  • Two kilogram of white glue
  • A 4” paintbrush
  • A plastic bucket
  • That is all.

This material is enough to cover for a water tank of 200 gallons. You can increase or decrease the quantity based on the size of your tank. All these materials can be purchased from a paint or building material shop and they are not very expensive too.

The procedure is very simple. Take a plastic container, may be a bucket, add about 3 kilogram of calcium carbonate powder in it. Add some water and keep stirring to make a uniform paste. Lumps will start developing at the start but with constant stirring, a fine paste will be prepared. You can use a stick to stir the paste. When a homogeneous paste is ready, add about 1.5 kilograms of glue to it and stir again. It will take about 5 minutes to get the paste ready.

Have you tried this method before

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Now carry this bucket with the paintbrush to the roof where the water tank is installed. All you have to do is to paint a thin layer of this paste all over the tank. You need to make sure all sides of the tank are covered with this paste. Please pay attention to corners, bottom part and where the pipes are attached. These will be a bit difficult sections but could be done with a little effort. It took me about half an hour to cover the whole tank. Once you are all done with the tank, watch closely how much part of the water pipe coming to and going from the tank is open to sunlight. You need to add a layer of this paste to these parts of the pipes as well. If you don’t do this, the cooling factor would be affected, as the water will get hot while passing through these pipes. This way you can cover the water tank of the size of 200 gallons with about 4 kg of the powder and about 1.5 kilograms of the white glue. Let the things cool down. Preferably, perform this activity in the morning so that the paste can dry through the day in sunlight. Fill the tank with water as you will normally do and you will be amazed to see the results. I filled the tank with water in the morning when water was pleasantly cold. Until about 2pm, there was no change in water temperature. It was same like in the morning. This was really an amazing and good news for us. By 5pm, the water temperature increased by about 2-3 degrees. On the day when I did this assignment, the maximum day temperature at noon was 42 degrees.

On the next day, you need to use the remaining material i.e. about 1 kg of the calcium carbonate powder and about 500 grams of white glue. Mix them together the same way we did on the previous day. Reach out to the water tank on the roof and look for any spaces left yesterday or created after the white layer was dried. Fill out all those spaces same way with the paste and that’s all, you are done.

I am hopeful the results will also be encouraging in winter. I did some research on calcium carbonate and came to know that, in addition to many other uses, it also works as insulating agent. This simple, short, economical and effective procedure has really gone well for us.

water tank painted with calcium carbonate
water tank painted with calcium carbonate | Source

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      shadabzmail 15 months ago

      Can this be applied without any bad effects, on an overhead black Sintex tank?

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      Asif 15 months ago from Lahore

      I am not sure about that. I tried it on a fiberglass tank.

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      Murry Gammash 11 months ago

      Would you please tell me which white glue did you use?

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      Asif 11 months ago from Lahore

      any wood glue would do.

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      ibrahim 11 months ago

      can this paste work on plastic water tanki 200 gln generally in blue color for use water storage on the roof.

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      Asif 11 months ago from Lahore

      Fiberglass is a kind of plastic I believe that I used. It was of red color.

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      Sandeep Singh 11 months ago

      Please tell me can we apply this paste on concrete made water tank

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      Asif 11 months ago from Lahore

      I think it should work because its main job is to reflect sunlight. If a thick layer is established, I believe it would work.

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      Simar Kohli 11 months ago

      Can you please specify the type of calcium carbonate powder you used?

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      Asif 11 months ago from Lahore

      Are there any types ? I am not aware of that. I used it in powdered form.

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      Arif zaman 3 months ago

      My tank is green plastic .can i use this method.is it really usefull

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      Asif 6 weeks ago from Lahore

      yes, that's the drawback that it washes away with rain. You need to adjust the amount of glue in a way to get maximum stability during rain.

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      farhan 5 weeks ago

      where to buy fine powdered calcium carbonate. hardware stores they don't know about it paint shops too.

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      Asif 5 weeks ago from Lahore

      Try some chemical store or industrial material store

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      Mduydv12@gmail.com 4 weeks ago

      What a nonsense. This is a cheap publicity. Cement is also made from calcium is not this get warm while day. The most nonsense post

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      K N Ajith Kumar 2 weeks ago

      Tis is one of the methods to insulate the tank .Now,many Modern insulating materials including foam wraps are available to insulate tanks and pipes.But the real problem is the water supplied to the tank in summer is normally very hot and if we Insulate the tank,the temperature will remain same as in a Thermo flask.Hence,mostly in hot climate areas ,shower chillers are attached to the Pipe to cool the water going to the tank and then insulate the tank and the supply pipes.

      Now,more innovations are coming in like self cooling eco friendly water tanks.

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      Hamad 2 weeks ago

      Will this work in my country Saudi Arabia when the temperature reached 50 degree? I mean will this material last and will I need to renew it after some years or yearly?

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      Asif 2 weeks ago from Lahore

      I think you will have to do it every year.

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      Mohamed 8 days ago

      I installed a fan on the top of the tank so the hot air come inside and leave the tank with some water steam after 3 hours the temperature of the tank water start dropping down until it be cold even at 1300 pm. ... the fan have to stay working from morning until 1700pm

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      Asif 8 days ago from Lahore

      There would be an extra cost for fan, electricity as well as maintenance of fan.

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      Shamiul Alam 4 days ago

      Calcium Carbonate is chun (in Bangla). Ask for "chun" in paint shop (rong er dokan).

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      Hamad 40 hours ago

      Using fan depend in the humidity, if the city is near the sea the fan mostly will not affect the water temperature. Plus if the air around is dusty it will enter the tank and cause build up of dirt with time and germs will grew inside the tanks that will needs cleaning it in shorter periods of times.

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