Reusable Dewatering Bag For Large Jobs And Big Savings. Use for dewatering operations with large quantities of silt, sediment, or dirt. Bags can be emptied and reused repeatedly. Large 35 opening allows easy access and removal of trapped sedimentGalvanized steel Locking Rods (Part# 9735) are quickly and easily installed to secure bag opening during dewatering. Helps comply with NPDES, 40 CFR 122.26 (1999).