Who does what.
Most of the 38 verified businesses in the directory sell watermakers. Far fewer install them, fewer still repair them, and only some carry the parts. These pages split the directory by what each business says it actually does — and then by where.
Fitting a system into a boat is most of the cost that is not the box itself. These businesses do the through-hulls, the plumbing and the wiring, not just the sale.
Annual service, membrane cleaning, pump rebuilds and the diagnosis when output falls. These businesses work on systems rather than only selling them.
Prefilters, membranes, pump seals and pickling chemicals. The running cost nobody quotes you at the point of sale, and the reason to check parts availability before you buy a brand.
Working out what the boat actually needs before anyone quotes hardware: daily litres, the voltage, the space, and whether your power system can carry it.
How these are assigned. The directory records each business’s services in its own words. A provider appears under a service when its listing, its category or the note recorded at verification names that work. Nothing here is inferred from what a business of that type usually does — if a listing does not claim it, the page does not either.