How Do Marine Water Makers Work?

Reverse osmosis marine water makers produce fresh water by pressurizing salt water to around 800psi and forcing it through a semi-permeable membrane (a very small filter screen).  Water molecules can pass through the membrane but practically all contaminants such as salt, bacteria, viruses and grit are left behind.

How much fresh water output do you need?

The World Health Organization recommends at least one liter (approx. one quart) of fresh water per person per day to maintain hydration.  Obviously, that figure is for survival conditions.  A freshwater consumption of two quarts per person per day is more realistic, assuming that this is augmented with other liquids and that normal water conservation methods are used.

The US Coast Guard recommendation is to carry 30 gallons of water per person, per day.

Important points to remember:

All RO Systems have the same basic components.