The Importance of Regular Maintenance for Marine Water Makers

A reliable source of fresh water is essential for any extended boating trip, especially when cruising offshore or in remote locations. That’s where marine water makers come in—converting seawater into potable fresh water, allowing yachts and large boats to operate independently of dockside refills. However, like any complex mechanical system, a water maker requires regular maintenance to function efficiently and provide clean, safe water throughout your voyage.

In this guide, we’ll explore why routine maintenance is vital, outline best practices for caring for your marine water maker, and highlight tips to prolong the life of your system and ensure it delivers consistent performance under varying conditions.

1. Why Marine Water Maker Maintenance Matters

Marine water makers, also known as desalination systems, use reverse osmosis (RO) to filter salt, bacteria, and impurities from seawater. They are powerful and efficient, but they operate under high pressure and harsh conditions, making them vulnerable to wear and contamination.

Neglecting maintenance can lead to:

• Reduced water output and slower production

• Membrane fouling or scaling from salt, calcium, and biological contaminants

• Clogged pre-filters, decreasing system efficiency

• Pump and valve damage from sediment and corrosion

• Bacterial growth, compromising water quality and safety

Routine maintenance preserves water quality, extends component life, and reduces the risk of expensive repairs or downtime during critical moments offshore.

2. Key Components Requiring Regular Maintenance

Understanding which parts of your water maker require attention helps prioritize tasks and schedules. Major components include:

A. Pre-Filters

• Trap sediment, sand, and organic matter before water enters the main filtration system.

• These should be checked and replaced every 50–100 hours of operation, or sooner in murky water.

B. High-Pressure Pump

• Pressurizes seawater to push it through the reverse osmosis membrane.

• Requires regular oil checks and changes (if oil-lubricated) and periodic inspection for leaks or wear.

C. RO Membranes

• Perform the main desalination process.

• Should be flushed after each use with freshwater and chemically cleaned if flow rate drops or water quality declines.

D. Carbon Filters (if equipped)

• Remove chlorine and protect the RO membrane from damage.

• Replace on schedule or if chlorine is detected in the water supply.

E. Valves and Seals

• Must be inspected for corrosion, salt buildup, or leakage.

• Lubricate or replace as needed.

3. Daily and Weekly Water Maker Maintenance

During active use, your water maker should be inspected and maintained frequently to ensure consistent output.

Daily Maintenance Tips:

1. Inspect pre-filters for clogging or color change.

2. Check system pressure and flow rate while in operation.

3. Flush with fresh water after every use (most systems like Sea Recovery offer an automatic or manual flush option).

4. Monitor salinity levels and water quality.

Weekly Maintenance Tips:

1. Clean pre-filters or replace them if they appear dirty or the flow rate is reduced.

2. Inspect hoses, clamps, and fittings for signs of salt or corrosion.

3. Check pump operation for abnormal noises or reduced pressure.

4. Wipe down the exterior of the unit to remove any salt buildup.

4. Seasonal or Long-Term Maintenance

If your vessel is laid up or you won’t be using the water maker for several weeks, more extensive steps are necessary to prevent biological fouling and membrane damage.

A. System Pickling

Pickling involves flushing the RO membrane with a storage chemical (usually sodium metabisulfite) that inhibits bacterial growth.

• Perform pickling before extended lay-up (over 7 days without use).

• Always use the manufacturer’s recommended solution and procedure.

• Label the system as "pickled" and note the date.

B. Membrane Cleaning

If you notice a drop in water output or quality, your membranes may be fouled with biological material or scale.

• Use an appropriate alkaline cleaner for biofouling or acid cleaner for scale.

• Always flush the system thoroughly afterward.

C. Annual Maintenance Checklist

1. Replace all pre-filters and carbon filters.

2. Change pump oil and inspect seals.

3. Check all electrical connections for corrosion.

4. Inspect high-pressure hoses for signs of wear or bulging.

5. Recalibrate or replace flow meters and pressure gauges as needed.

5. Monitoring Water Quality and Performance

Consistent monitoring ensures your water maker is functioning correctly and delivering potable water.

Use a TDS (Total Dissolved Solids) Meter

• Readings under 500 ppm are considered potable.

• Readings over 1,000 ppm indicate membrane fouling or failure.

Track Output and Pressure

• Low pressure or reduced output often signals clogged filters or worn pump seals.

• High pressure may indicate scaling in the membranes.

6. Tips to Extend Water Maker Life

A. Only Run in Clean Water

• Avoid operating the system near harbors, river mouths, or shallow sediment-rich waters.

B. Always Flush After Use

• Flushing removes residual salt that can lead to membrane scaling and bacteria buildup.

C. Keep a Logbook

• Record hours of operation, maintenance tasks, filter changes, and water quality readings.

D. Stock Spare Parts Onboard

• Keep spare pre-filters, carbon filters, pickling solution, and pump oil on hand for quick maintenance during long trips.

E. Train Your Crew

• Ensure anyone operating the system knows how to monitor performance, replace filters, and perform basic maintenance.

7. Choosing the Right Water Maker for Maintenance Ease

When selecting a water maker, consider brands that are known for durability, support, and ease of maintenance.

Sea Recovery Aquamatic Series

• One of the most reliable and serviceable water makers in the marine market.

• Features automatic freshwater flush and remote monitoring.

• Easily accessible filter housings and membrane replacement options.

A unit with automated maintenance functions (like auto-flush and membrane protection) greatly simplifies the upkeep required.

8. Troubleshooting Common Water Maker Problems

Low Output or Slow Production

• Check pre-filters for clogging

• Inspect membrane for fouling

• Ensure sufficient seawater intake and pump function

Water Tastes or Smells Bad

• Replace carbon filters

• Pickle system if stored too long without use

System Won’t Start or Build Pressure

• Check pump and electrical connections

• Inspect for leaks or air in the lines

Salinity is Too High

• Flush membranes

• Clean or replace RO membrane

Ensure Fresh Water Reliability with S & S Dockside Marine Supply

A well-maintained water maker is a game-changer for long-distance boating, providing freedom from dockside water and peace of mind during offshore adventures. By following routine maintenance practices—daily inspections, seasonal care, and periodic cleanings—you can ensure your system remains efficient, safe, and long-lasting.

At S & S Dockside Marine Supply, we offer a wide selection of replacement filters, membrane cleaning kits, pickling solutions, and Sea Recovery water maker parts. Whether you’re prepping for the season or managing maintenance mid-voyage, S & S Dockside Marine Supply has what you need to keep your fresh water flowing.

Explore our inventory today and equip your boat with the tools to stay hydrated, clean, and worry-free—no matter where your journey takes you.