
The last thing you want when you’re planning a long voyage at sea is to have to come ashore before planned. You can deal with a lot while you’re on your boat, but one thing you certainly cannot “handle” is a lack of fresh water. This is why a reverse osmosis system is an essential part of your gear.
Let’s discuss exactly what this is, as well as a few other common questions. How long do RO systems last? Which reverse osmosis machine should you buy?
Table of Contents
- What is an RO System?
- How Long Do RO Systems Last?
- Signs You Need a New Membrane Filter
- How to Make Water Maker Last Longer?
- Cruise RO Water Systems
What is an RO System?
In this case, “RO” stands for reverse osmosis. A reverse osmosis system works via membrane filtration technology. It forces water under pressure through the very tiny pores of a semi-permeable membrane.
It is an advanced water purification method initially developed by the U.S. Navy to produce drinking water from seawater. Navy submarine crews initially used RO systems for long periods. Reverse osmosis machines run on water pressure, so no electricity is needed!

How Long Do RO Systems Last?
A RO water system will last virtually forever if you service it regularly and replace parts that wear out. Its components experience natural wear and tear over time and will need periodic replacement to ensure optimal performance. Key parts that may need replacement include the storage tank, the faucet, and various filters.
You can expect the membrane lifespan to be about 2 to 5 years. High levels of contaminants, such as heavy sediment, chlorine, or hard minerals, may cause the membrane to degrade faster. Conversely, if the incoming water is cleaner and the pre-filters are changed regularly, the membrane may last on the higher end of the lifespan range.
We recommend you change the RO membrane every 24 months, just to be on the safe side.
Signs You Need a New Membrane Filter
If you aren’t sure whether your reverse osmosis system is ready for new RO filters, these are the signs you should be looking for:
#1 Your Water Tastes Bad
A change in water taste or odor is a key indicator that your RO membrane may be worn out. If your water starts to taste metallic, salty, or musty, it means the membrane is no longer effectively filtering out contaminants, and it’s time for a replacement.
#2 Water Pressure is Poor
If you notice a significant drop in water pressure or slower flow from your RO system, the membrane might be clogged or degraded. A failing membrane restricts water flow, affecting filtration efficiency and water output.
#3 The System is Constantly Cycling
An RO system that is constantly running or cycling more than usual could mean the membrane is no longer filtering water properly, causing the system to work overtime. If you notice this, it’s time to check and possibly replace the membrane.
Remember, if the membrane filters aren’t clean, your system can’t do its job. A poor water filter system gives you poor water. When you’re out at sea with no other form of fresh water, this simply will not do. We recommend replacing the filters on your reverse osmosis machine system before you leave for a trip if:
- You haven’t changed them in over 24 months.
- If it will be over 24 months since a change during your trip.

How to Make Water Makers Last Longer?
Maintaining your water maker properly can significantly extend its lifespan and ensure that it operates efficiently when you need it the most. Below are several tips to make your water maker last longer:
Regular Cleaning
Saltwater can cause buildup on the membranes of your water maker. Regularly cleaning the unit according to the manufacturer’s instructions is vital to prevent scale and other blockages.
Flushing the System
After each use, it’s a good idea to flush the system with fresh water to prevent salt buildup, especially if you’re operating in areas with high salinity.
Use a Pre-filter
A pre-filter can catch large particles and debris that can damage your water maker’s components, thus prolonging its life.
Regular Inspections
Check for leaks, unusual sounds, or irregular performance, and replace worn-out parts as soon as possible.
Get Your RO Systems from Cruise RO Water and Power
Now that you know how long RO systems last, the next step is to purchase one for your upcoming trip.
As specialists in maritime technology, Cruise RO is proud to offer SeaMaker and Schenker watermakers, establishing a new benchmark for excellence in marine water purification.
You want the best, which means buying a Cruise RO Water and Power product. We take pride in being innovators and on-board water treatment industry leaders!
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