The 30SWS has everything the 30SWP has, but with a stainless steel frame. This will significantly increase the spreaders’ longevity of life when working with harsh, corrosive materials such as salt and fertilizer. Salt and fertilizer are extremely aggressive materials and will rust exposed metal. Having a stainless steel frame provides protection against corrosion and ensures a longer life for the product. The stainless steel frame and fasteners, the new spider agitation system and the many advanced Cresco features make the 30SWS the ultimate heavy use spreader.