Water is the essence of life, and health is synonymous with pure water. This saying, which is by Audrey Hepburn, is indeed very fitting for RV travelers, as they enjoy the fresh water of different places as often as the different landscapes.
Going on a journey means relying on the water supply at each new place, which can be somewhat unpredictable. One day it is nice and clean and the next it may have a lot of minerals, chlorine or even some contaminants that you cannot see.
For the modern RV owners a small RO water system is not so much a convenience but rather a protection, as it guarantees that every glass poured is pure, safe, and, most importantly, consistent in taste. With proper planning, the installation of an RO system in an RV can be a very easy upgrade.
This guide offers the simplest steps and practical tips to fill your RV with dependable, clean water wherever your adventure leads you.
Why Choose a Compact RO Water System for Your RV?
A compact RO unit conducts a multi-stage filtration process for the water. It takes out various impurities like sediment, chlorine, chemicals, heavy metals, and even dissolved solids. The system is installed by many RV travelers when the standard RV water filters do not ensure their health and comfort for a long time.
Key Benefits
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Better-tasting drinking water
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Reduced hard water scaling
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Less strain on RV plumbing
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Cleaner water for cooking and coffee
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Peace of mind when traveling to new locations
A compact RO unit also pairs well with other RV water solutions such as an RV water softener, RV water filter for hard water, and whole RV drinking water system setups.
How an RO System Works
Before installation, it helps to know what happens inside a reverse osmosis unit:
Main Components
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Sediment filter – captures sand and rust
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Carbon block filter – reduces chlorine and odors
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RO membrane – removes dissolved solids and contaminants
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Storage tank – holds filtered water
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Faucet – dispenses clean water
The RO water system uses pressure to push water through these layers. The result is clean, light, and fresh-tasting water.
Tools and Supplies You Will Need
Before you start installation, gather the following items:
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Compact RO water system
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Tubing and connectors (usually included)
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Adjustable wrench
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Drill (for faucet hole if needed)
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Teflon tape
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Mounting screws
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RV-safe sealant
Some RVs already have an extra hole for a filtered water faucet. If not, you may need to drill one in the sink area.
Choosing the Right Location for Your RO System
Common Installation Spots
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Under the kitchen sink
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Inside a lower cabinet
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Next to the water pump area
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Storage compartment near plumbing lines
Pick a location with:
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Enough room for the storage tank
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Easy access to cold-water lines
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Ventilation for the system
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Minimal vibration
Compact RO systems are designed for tight spaces, making them ideal for small RVs, fifth wheels, and motorhomes.
How to Install a Compact RO Water System in Your RV
1. Turn Off the Water
Find the main water valve in your RV and turn it off. Open your kitchen sink tap to let any water left in the pipes out. This stops leaks while you work.
2. Connect the Water Adapter
Look under the sink for the cold water pipe. Get the feed water adapter that came with your RO system. Use Teflon tape to wrap around the threads then screw on the adapter tightly so water doesn't leak. This adapter lets water flow into the RO filter.
3. Mount the RO Filters
Find a spot on the cabinet wall or floor under your sink. Use screws or brackets to attach the RO filter unit upright. Make sure you can reach the filters when you need to change them. Keeping them vertical helps water flow well.
4. Put the Storage Tank in Place
Stand the RO tank upright inside the cabinet, near the filter unit. Most tanks are made to fit under RV sinks. Leave a little space for the tubes and make sure the tank can sit securely on its own.
5. Install the Faucet
If your RV has an extra hole:
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Insert the RO faucet
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Secure it with the mounting hardware
If not:
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Drill a small hole in a clear area of your sink
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Seal the edges with RV-safe sealant
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Install the faucet securely
6. Connect the Tubing
Your RO water system will have color-coded tubing:
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Feed line – from cold water to filters
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Tank line – from filters to tank
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Faucet line – from filters to faucet
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Drain line – from filters to drain saddle
Push the tubing firmly into each fitting. You should feel it click into place.
7. Install the Drain Saddle
Attach the drain saddle to your sink’s drainpipe. This is where wastewater from the RO membrane will go. Avoid placing it near a curve in the pipe.
8. Turn On the Water and Check for Leaks
Slowly turn on the water supply. Check all connectors, valves, and tubing. Tighten if needed.
Let the system run and fill the tank for the first time. Then empty the tank to flush the filters. This helps remove any carbon dust.
Maintenance Tips for Your RO System
A compact RO water system is low-maintenance when cared for properly.
Replace Filters Regularly
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Sediment filter: every 6–12 months
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Carbon filter: every 6–12 months
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RO membrane: every 2–3 years
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Post filter: every 12 months
Use an RV Water Softener (Optional)
Soft water helps:
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Extend the life of the RO membrane
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Reduce scaling
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Improve taste
Monitor Water Pressure
RO systems work best at 40–80 PSI. If your campground has low pressure, you may need a booster pump.
Keep Spare Parts
Carry:
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Extra tubing
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Replacement filters
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Sealant
This is helpful when traveling long distances.
Safety Tips During Installation
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Always shut off water before connecting fittings
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Check for leaks after each step
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Keep tubing away from sharp edges
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Label your lines for easy future maintenance
To Finish
Installing a compact RO water system in your RV is one of the best upgrades you can make for clean and safe drinking water. It takes a little time but the benefits last for years. You get better water quality, less worry while traveling and protection for your health and your RV plumbing.
If you want high-quality filters, accessories or full systems, explore the wide selection at RV Water Filter today.
Common RV RO Installation Questions
Does an RO System Waste Water?
Yes, RO systems produce wastewater, but compact units now have higher efficiency. Some waste as little as 3 gallons for every gallon purified.
Can I Use an RO System With Hard Water?
Yes, but using an RV water filter for hard water or a water softener improves performance.
Will It Fit in a Small RV?
Compact RO units are designed for tight spaces. They fit under most RV sinks.
