I have no suggestion for already hard salt. But when you fill your salt shake add some rice grains in it. This will prevent the salt going hard. Happy Holidays
By
12/21/2009
Put the salt in a zip type bag, place a towel on top of it and use your meat tenderizer to pound it. You can also put it in a blender.
After getting it powdered again, put it in a jar with a tight or 2 piece canning lid.
Since I live in Oregon and everything eventually gets wet, crackers get stale really fast, etc. I keep everything in 1/2 gallon canning jars with the 2 piece canning lids and I never have a problem. After 2 years in a canning jar, my brown sugar is still as soft as the day I bought it!
When you fill your salt shaker add some regular {not instant} rice to the shaker and it will absorb moisture and keep it soft.