This compact shower sump system is designed to meet the higher demands from today's boating industry where more equipment is used. Includes the fresh water system onboard and involves showers, dishwashing machines, galley sinks, etc. The shower sump turns on/off automatically using our Ultima switch technology and has multiple inlet ports for handling waste water from more than one tapping point. The check valve on the outlet stops water from flowing back into the tank. The tank has a tight-fitting lid to minimize splashing and odors. To further aid in cleaning, the system includes an easily removable mesh filter.