Filtered Water has a Bad Odour and/or Taste: Water filters and purifiers contain a multitude of filters and membranes to remove different types of impurities such as chemicals, heavy metals, germs, etc. from tap water. In some cases, one or more of these components may get clogged or malfunction making the filtered water smell or taste bad. If you are facing this problem then first you need to check the tap water for its smell and odour. If the tap water is not smelling or tasting bad then you need to hire RO inspection and repair services. The professionals will inspect the machine, unclog any clogged components and replace faulty components of the water purifier.