I FOUND TO KEEP MY SALT FROM GETTING MOISTURE SOAKED, I PUT SOME RICE IN THE SHAKER AND THEN SET MY MCCORMICK SALT SHAKER UNDER A GLASS WHEN I FINISH USING IT . I KEEP LID CLOSED OF COURSE. IT HAS BEEN 2MO. AND IT IS STILL FLOWING FREE! WORK FOR ME!
I replaced all the shakers in the resort with pepper mills. Salt will be moist, but the grinder will still feed it out nicely.
And, btw, don't forget to remove the rice when you put it in the mill. The staff did once. It was not a nice experience. Luckily, I was the one to find out and not a guest. Use the clear glass grinders so you can see the salt. Nicer to see that it's fresh.