Water powered. No electricity. No Installation. Waterlogs are a revolution in making water on a yacht. No maintenance. No electrics. Very simple. Filters are stainless steel, wash them out and reuse. Membrane will last for up to 7 years with proper service. Only one moving part. Emergency 12 V motor available. Makes 50 GPD. Just tow behind the boat at 5-12 knots. Can also be pumped by hand.