Take large salt. Pass it through a sieve. That salt, which has passed through a sieve use in cookery as usual salt. The large salt, that has not passed through a sieve add to flour (about 1kg of the large salt on 10kg of flour). Mix them a little. Before use pass flour through a sieve. The flour will pass through the sieve. The large salt remains on a sieve. This salt can be used repeatedly. It is not recommended to store a mix of flour and salt in an iron tank.
