The Cape Horn system is designed for the extreme rough service typically found on high speed racing yachts. The two diaphragm feed pumps cannot be damaged by feed water intake aeration or by running dry. This versatile system has the option of running on a single feed pump for high efficiency, or two pumps for high capacity. If one pump should fail, the unit will still produce fresh water from the remaining pump. There are no complicated electronics, only simple mechanical controls and gauges. The wiring is also simple, consisting of only on/off electric switching and there are only three modules to mount- two feed pump-filter modules and the Clark pump-membrane module.