When the tiniest amount of moisture gets into your salt, it tends to clump up and make it annoying to shake out. To prevent that from happening, Secret Tips from the Yumiverse suggests adding a couple of uncooked rice grains into the shaker.
You want to make sure the grains of rice aren't small enough to fit through the salt shaker holes. Once the rice is in there, it will soak up any excess moisture and keep the salt from clumping. It should also work in any other shakers you have around that seem to store moisture. Head over to Secret Tips from the Yumiverse for a few more uses for rice grains.
8 Amazing Non-Edible Uses for Rice Grains [Secret Tips from the Yumiverse]