Sea Salt, also known as Solar Salt, is the smallest source of salt in Pakistan. It is produced by trapping sea water in artificially formed ponds where the sea water evaporates with the help of the sun in the form of hot weather and the flowing winds. Hub-Pak uses this sea salt exclusively for industrial salt production purposes as it is not fit for use as edible salt.
The quality of the salt produced at each of these factories varies since the conditions at each factory are different. Karachi enjoys suitable conditions like the excellent sea shore and fast winds all around the year. Keeping this in mind, all the seven factories are located in or around the cosmopolitan city of Karachi.
With the ideal conditions in the city, the purity level of salt can go up to 98% of purity at times. Depending on the season and the individual factory management, the purity levels vary between 95% and 98%. Average rainfall in Karachi is quite low throughout the year. This helps in the production of solar salt.