Before you start
Gather the appropriate supplies and review the specific equipment manual.
- Watermaker manual
- Clean prefilters
- Test kit if specified
Step-by-step instructions
Read the specific startup procedure
Watermakers vary in flush sequence, operating pressure and required minimum flow.
Verify intake water and seacocks
Use clean seawater away from oily or contaminated harbors and confirm appropriate seacock positions.
Inspect prefilters and hoses
Replace dirty elements and check for air leaks and visible hose damage while depressurized.
Start at the required pressure and flow
Follow the manufacturer sequence precisely; never force a pressure regulator beyond specified limits.
Check product water and log output
Divert initial water as instructed, test quality where required and log pressure, flow and salinity trends.
Safety note
High-pressure watermaker lines can inject fluid through skin. Shut down and fully depressurize before inspection or maintenance.
Key takeaway
Log pressure and product flow together; either reading alone can mislead.
Keep this job on your maintenance schedule
Save the topic as a maintenance task, choose a due date or engine-hour target, and record future service. Free and stored on your device.
Add to my maintenance plannerThis guide is for general education. Follow your equipment manufacturer’s instructions, current navigation guidance and applicable marine safety standards. When uncertain, use a qualified marine professional.