A better type of Ultra Dewatering Bags discussed here is the Ultra Reusable Dewatering Bags. These bags have large opening which makes it easy for dewatering operator to access and remove the trapped sediment, silt or dirt. They have galvanized steel locking rods that can be installed rapidly and easily to secure bag opening during dewatering process. And what more, these bags also comply with NPDES 40 CFR 122.26 (1996) used as BMPs in Stormwater Pollution Prevention Plans. The Ultra Reusable Dewatering Bags are a lot more expensive than the non-reusable ones, but in the long run, it saves a lot more money. Definitely worth having.