Sendha Namak is nothing but rock salt. It has a lower content iodine
sodium when compared to the ordinary table salt. Sendha namak is also not iodinated.
Rock salt is mot derived from marine sources like the normal salt
which is got from the sea. Rock salt is mined.The chemical formula is NaCl and the mineral is also called as halite.
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Now we use it in fasting because we get it from rocks and it is very pure in every means as it does not contains so many other chemicals and impurities whereas we get table salt from the sea which also contains lot of marine creatures at the time of extraction so it is basically not used in fast as during fast we have to eat only veg food.
The logic behind using this salt during fast is that it is pure as it does not pass from any artificial process. It is not iodized so we should not use it in our regular daily meals