Purchase a food color from your nearest store and place the couple drops in your water tank of the toilet. Wait for 15 minutes and make sure nobody going to use the toilet at this time. Check after 15 minutes, if you find coloring bowl then you have a leak at the bottom of the tank.

If you have knowledge of basic plumbing then you can find and repair this leak yourself otherwise you have to call a professional plumber or water leak detector.

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