Manna Marine

Blue Water Desalination's current South Pacific dealer page identifies Manna Marine in Mandurah as an Australian dealer.

Watermaker Products And Services

The relevant systems or brands are Blue Water Desalination systems. The business advertises or is verified for Watermaker sales; marine equipment support; dealer enquiries. Its principal location for this directory is Mandurah WA, with practical coverage described as Mandurah and Western Australia.

What Sailors Should Know

A marine watermaker is a reverse-osmosis desalination plant, not simply a filter. It draws seawater through an intake and pre-filter system, raises the pressure sufficiently for the RO membrane to separate fresh product water from concentrated brine, then sends the usable water toward a test point or tank. Production depends on seawater temperature, salinity, membrane condition, feed pressure and system design, so advertised litres per hour should be treated as a rated figure rather than a guaranteed output in every anchorage.

For a dealer or broader marine business, sailors should confirm whether the company only supplies the unit or can also organise installation, commissioning and after-sales service. The difference matters because watermakers need periodic filters, freshwater flushing, membrane care and troubleshooting, and a local technician familiar with the installed system can be more valuable than the initial purchase price.

Sizing A Watermaker For A Cruising Boat

Output should be chosen from the crew's real daily water use rather than from boat length alone. Drinking and cooking may require relatively little water, while regular showers, washing machines, deck rinsing and liveaboard use can multiply consumption. A higher-output unit can shorten run time but may demand more AC or DC power. A low-energy DC system can suit a solar-heavy yacht but may need to run for many hours to fill the tanks. Owners should compare litres per hour, watts consumed, daily energy required and the capacity of the boat's battery, alternator, solar, inverter or generator system.

Installation space is equally important. Modular systems allow the membranes, filters and pumps to be separated around a machinery space, while framed systems can be easier to install and service when enough room exists. The intake should be located where it is unlikely to draw air or contaminated harbour water. The brine discharge needs a reliable route overboard. Filters, pressure gauges, flushing valves and membrane housings should remain reachable for routine maintenance rather than being buried behind permanent joinery.

Maintenance And Long-Term Use

Watermakers reward regular use and correct shutdown procedures. Seawater left stagnant inside a membrane system can create biological fouling, so freshwater flushing is important when the unit will sit unused. Longer lay-ups may require preservation or pickling using the manufacturer's specified process. Prefilters need routine replacement and should be checked more often in silty, plankton-rich or polluted water. Product-water quality should be monitored before water is diverted into the main tank, particularly after servicing or a long period of storage.

Owners planning remote cruising should ask which spares are sensible to carry. Typical items may include sediment filters, pump service parts, O-rings, belts or impellers, hoses and preservation chemicals, but the correct kit depends on the specific system. Membranes often last a long time when operated and maintained correctly, so replacing them simply because of age is not always necessary. Diagnosis should consider feed flow, pressure, temperature and water quality before assuming the membrane has failed.