Before you start
Gather the appropriate supplies and review the specific equipment manual.
- Watermaker manual
- Flow and pressure log
- Correct test equipment
Step-by-step instructions
Compare with a known baseline
Note feed pressure, operating pressure, product flow, salinity and feed-water temperature.
Check feed-water conditions
Inspect accessible strainers, intake restrictions and filter condition only after shutdown and depressurization.
Look for air entry
Bubbles or a starving feed pump may point to suction-side leaks or unsuitable filter seals.
Review the manufacturer troubleshooting table
Different systems have different targets; do not assume a universal pressure setting.
Get professional help for high-pressure faults
Pump seals, regulators and membranes may require specialized diagnosis and service.
Safety note
Never loosen a high-pressure fitting or force a regulator while the system is pressurized.
Key takeaway
Pressure, flow, temperature and salinity together tell the useful story.
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.