I've seen a people recommend putting it in a pillow case and rinsing through that. Since I wasn't really able to visualize what they were talking about I took a big piece of cotton (sheet or a pillow case would certainly work) and laid it on top of a spaghetti collander. Rinsed for a little while and scooped the sand out into a water bucket, leaving the finest little particles behind. Dump the grit and repeat until out of sand.