Water Makers
As agents for Rainman Watermakers, we install and service all Rainman Watermakers in the Midwest Region.
Fresh Approach to Desalination
Compact system designed to generate freshwater supply from brackish or saltwater sources for marine and agriculture. They can be installed in a minimum footprint configuration or kept portable for maximum flexibility.
How Desalination Works?
The Rainman watermaker operates through a process called reverse osmosis (RO).
The system draws seawater up, filters out sediment and particulates, then puts the clean seawater under high pressure to pass through an RO membrane. The RO membrane is a semi-permeable polyamide thin-film composite.
A traditional filter, like our prefilter, works by passing all the water through it. The fine construct prevents larger particles from getting through and they are captured on the filter material. When a lot of particles have been captured on the filter and it’s dirty, you change it.
in comparison to the traditional filter, the reverse osmosis process has filtered seawater passed across the membrane surface at high pressure. Meaning, the system is essentially extracting a small percentage of the freshwater from the seawater stream. The majority of the water and all of the salt continues in the flow and out the brine waste water hose. The salt does not accumulate on the membrane, which is why RO membranes do not need to be cleaned or replaced regularly.
Since bacterias and viruses are much larger than salt molecules, they stay in the main seawater stream and are passed out with the brine waste water.
Water Maker Schematic Explained
An impeller lift pump draws sea water up to the pressure supply unit and creates positive pressure for the high pressure pump.
The pre-filter removes particulates larger than 5 microns from the water.
A plunger pump pressurises the system for the reverse osmosis membranes to operate.
The relief valve only opens if the control valve is closed excessively.
A high pressure hose carries filtered sea water to the reverse osmosis (RO) membranes.
Multiple membranes are connected in series (double RO membrane configuration).
The membranes extract approximately 20% of the water from the pressurised seawater stream.
The pressure control valve at the end of the system is used to set system pressure to 55 bar (800 psi).
Brine water is released to the sea while fresh water is routed to your drinking water tank.
Both the lift pump and high pressure pump are powered by either a reliable Honda 50cc engine or a fully sealed electric motor.