Before you start
Gather the appropriate supplies and review the specific equipment manual.
- Tank material details
- Water-system manual
- Potable-water cleaning guidance
Step-by-step instructions
Identify the tank system
Locate fill lines, vents, access ports, water filters and all tanks used for drinking water.
Choose a compatible cleaning approach
Follow manufacturer guidance for tank materials, watermaker membranes and attached carbon filters.
Isolate sensitive equipment
Ensure chemicals cannot reach a watermaker membrane or other equipment that can be permanently damaged.
Drain, clean and flush
Follow approved potable-water procedures; use accurate dilutions only where specified for your system.
Verify safe water
Flush thoroughly, replace approved filters and use suitable drinking-water testing if contamination is suspected.
Safety note
Never mix bleach with acids or ammonia. Chlorine can irreversibly damage many reverse-osmosis membranes.
Key takeaway
Water safety requires a maintained tank, clean fill practices and attention to filters—not just a freshwater smell.
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.