Rust forms on metal when there is residual water left on the surface that is exposed to the air. As you can see, this is exactly what happened to this exposed sump pump. Dr. Energy Saver offers the patented SmartSump® sump pump system specifically for crawl spaces. It is fully enclosed to ensure the pump and its casing do not rust out. Our trained production team can easily open the pump for its annual servicing. Once the pump is serviced they will ensure it is properly enclosed to prevent any possible rust. Call Dr. Energy Saver today to schedule your free inspection of your sump pump!