After having central heating installed, I no longer suffer from a dry cough at night, chapped lips, or dry skin in the winter. Washing using a hot solution of citric acid resolves the issue of washing and failure of the level indicator. Bring the citric acid and the 1.5 liters of water to a boil in a kettle. Rinse the level indicator through the holes in the container and the discs with a hot solution. After that, we give it a good soaking in water. Depending on how hard your water is, you may need to repeat this process every few months.
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