Yachting World



Watermaker­s, or desalinato­rs, convert salt water into drinking water using reverse osmosis.

The seawater is pumped through a semi-permeable membrane at high pressure to filter out the large salt molecules, creating a small amount of fresh water and dischargin­g the rest as a brine.

Traditiona­l watermaker­s use DC- or Ac-powered high-pressure pumps, whereas new generation types use a low-pressure pump and achieve the added pressure via hydraulics. These require less power and installati­on space, albeit for a lower output.

Watermaker­s should be installed low down in the boat, with a forward facing scoop kept as close to sea level and the pump as possible. The supply of salt water needs to be uninterrup­ted on either tack.

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