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Best RV Water Filter for Full-Time Living – 2025

When you’re living life on the road, there are endless ways to approach water filtration. Some RVers go all out with elaborate setups, while others trust the campground’s water supply and skip filtration altogether.

3 water filters hooked up from the spigot to an RV connected by hoses.Two water filters stacked on each other, hooked to a spigot with a hose leading to an RV.An inline water filter hooked to a spigot with a hose wrapped around the pedastal.

Here are 3 examples of water setups I captured just taking a walk around the block. Mind you, all of these would have to come off during the winter because they’d freeze and crack, leaving you with no filter.

But here’s the thing: campground water can be unpredictable. From sulfur-laden well water to water that leaves you questioning its source, having a reliable filter isn’t just a convenience—it’s a necessity. Especially for us.

For Court and me, clean water isn’t optional. We both have a chronic health condition that makes our bodies hypersensitive to bacteria. Even a small contaminant can lead to flare-ups, so having a top-notch water filter is essential to our full-time RV lifestyle. After 6 months and a cross-country trip, the Blu Tech MR3 water filter has quickly proven to be our favorite water filter since starting this lifestyle 5 years ago. Let’s dig into why.

1. Compact and Lightweight

All components of the Blu Tech R3 water filtration system

When your home has wheels, every pound matters. RVs and trucks have weight limits, and exceeding those is hard on your tires, axles, and can put you in some dangerous situations traveling at high speeds. That’s why we love that the Blu Tech MR3 is small in size and weight. Measuring in at only 5.5″ tall and 11 lbs, the Blu Tech MR3 is 8-10″ shorter and 17 lbs lighter than typical triple stage filters, making this the smallest triple stage filtration system we’ve ever see.

Its size and weight make the Blu Tech MR3 easy to tuck right in your underbay without tipping the scales. And this may seem like a crazy added bonus, but having your water filtration locked in your underbay also prevents you from having to chain it to your rig on the outside. Yes, we’ve seen this many times. People don’t want their expensive filtration systems stolen, so they lock them up the way you’d chain up a generator.

2. Three Layers of Filtration (Down to 0.2 Microns!)

Picture comparing the size of different micron levels.

Let’s talk about water quality. If you’ve been RVing for any length of time, you’ve probably encountered the wide spectrum of campground water. From iron-heavy well water that stains your toilet to water with a strong scent of chlorine, campground water is often questionable out of the spigot. With the Blu Tech MR3, you don’t have to worry about that little roll-of-the-dice adventure at each new stop. Using three layers of filtration that filter all the way down to 0.2 microns, your water is clean and safe no matter where you’re parked – plus, it tastes good!

  • Stage 1 filter: Handles large sediment, helping extend the life of the other filters.
  • Ultra-fine filtration: At 0.2 microns, Blu Tech filters are 100x finer than typical 20-micron RV filters, capturing contaminants most filters miss.
  • Taste improvement: Stage 3 filters out chlorine, hydrogen sulfide, and more, delivering water so fresh you’ll prefer it over bottled.

Here’s a visual for you of how much our filters captured between our initial install and our first filter change.

A used sediment pre-filter compared to a new sediment pre-filter.
A used sub-micron filter compared to a new sub-micron filter.
A used coconut shell granular activated carbon filter compared to a new one.
 

3. Easy Quick Connect System

A picture of quick connect hose adatpers.

If there’s one thing RVers dread after a long travel day, it’s the setup routine. Parking, leveling, hooking up utilities—it’s a whole process. And when you’re just stopping for the night, anything that makes that routine quicker and easier is worth its weight in gold.

The Blu Tech MR3’s quick connect system is a game changer for that end-of-the-day hookup. Instead of screwing and unscrewing a bulky inline filter, you simply snap the Blu Tech MR3 into place. The system includes a single connection at the spigot and a quick connect for the filter itself. No more unscrewing, draining, and lugging a waterlogged filter into your storage compartment, only to reverse the process the next day.

When it’s time to hit the road again, just unsnap the filter, disconnect the spigot connector, and you’re off. It’s so simple, you’ll wonder why every water filter doesn’t work this way.

4. Built to Last – UV and Corrosion Resistant

The Blu Tech MR3 doesn’t just look sturdy—it is sturdy. The filter frame is constructed with polycarbonate carbon fiber, a material that can withstand sun exposure without breaking down over time. The filters themselves are housed in stainless steel canisters, making them perfect for rain or shine. Whether you choose to store it in your underpass or let it brave the elements outside, this filter is built to handle it all.

Typically, filters come in plastic casings, which can fade and crack in sunlight, or freeze and crack in cold. You don’t have to worry about either of those situations with the Blu Tech stainless steel canisters.

5. High-Flow Rate Without Compromise

Picture of high-flow from a faucet.

One of the most frustrating things about some RV water filters is how they drag your water pressure down to a dribble. Not the Blu Tech MR3. This filter delivers exceptional water quality without sacrificing flow rate. You can get over 1,000 gallons of filtered water a day, all while enjoying the pressure you love. It’s like having your cake and eating it too—only the cake is clean water.

Above is a picture of our water flow from our actual sink.

6. Perfect for Winter Camping

A heated hose hooked to a water filter in a fifth wheel underpass with snow on the ground below.

Here’s another game-changer: the Blu Tech MR3 is small enough to fit right into your underpass, and if your underpass is heated like ours, you’re set for winter. When your rig’s interior is 65 degrees, so is the underpass, meaning the filter stays safe from freezing temperatures. There’s no need to build a special box or disconnect it when the temperature dip. We attach the quick connect adapters to our heated hose, hook it up to the Blu Tech MR3 inside the underpass, and forget about it. No fuss, no freezing, no problem.

 

How the Blu Tech MR3 Stacks Up

Let’s compare the Blu Tech MR3 to the typical inline water filters most RVers are used to:

A Blu Tech MR3 filtration system compared to typical water filters.
 

Why It’s Perfect for Full-Timers

Full-time RV living means everything you own has to earn its keep, and the Blu Tech MR3 has certainly earned its keep in our household. It’s small enough to fit seamlessly into your storage, powerful enough to handle questionable water sources, and convenient enough to make setup and breakdown a breeze. Whether you’re parked at a luxury RV resort or moochdocking in someone’s yard, this filter is built to keep up with your lifestyle.

If you’re looking to upgrade your RV setup this year, do yourself a favor and check out the Blu Tech MR3 over at MobileMustHave. It’s peace of mind you can taste—literally. And if you use the link above, you’ll get 5% off your entire order.

Cheers to clean water and smooth travels! 

 

*This post is sponsored by MobileMustHave. While we received the Blu Tech R3 water filter in exchange for this review, all opinions, experiences, and recommendations are our own. We don’t recommend products to you that we don’t truly use ourselves.