All towns here have grizzlies to screen winter sand. The material is already screened in million dollar screen plants to 3/8" minus, then mixed with salt. The grizzlies only separate frozen clumps in very cold weather. They have all screen members arranged 2" apart at perhaps a 45 degree angle. They too get clumps stuck, but a less frigid day, the salt content melts it & it falls through. I do not believe you will be happy with a passive screen with any horizontal component. Look at Rock Tough, or their competitors, nothing horizontal.