Huge Savings · Huge Selection. The saltwater system features /2” (38mm) connections. It is accordingly supplied with adaptors A (1) and B (8) for connecting to the small /4” (32mm) diameter connections/hoses. Install . • The Saltwater System requires a separate filter pump [~ gph (~ lph)] to drive the water and function properly. • The Saltwater System must be installed as the last piece of .