Review: Express Water RO5DX Reverse Osmosis Water Filter System

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In this review, we are going to take a thorough look at the Express Water RO5DX reverse osmosis water filter system – a great choice if you are on a tight budget. The system uses a 5-stage filtration process to filter over 100 different contaminants and provide delicious, healthy drinking water.

Express Water RO5DX

Express Water RO5DX

Filter Stages:5
Daily Water Limit:50 gpd
NSF Standard:58
Warranty:1 Year

Our Rating

Express Water RO5DX – Key Features

  • Stage 1: At stage 1, unfiltered water passes through a 5-micron sediment pre-filter, which traps dirt, dust, sand and rust. The goal here is to protect the subsequent filter stages from clogging to extend their lifetime and save you time and money.
  • Stage 2/3: A carbon block and a granular activated carbon pre-filter reduce chlorine, VOCs (volatile organic compounds) and other compounds that cause unpleasant tastes and odors. As an additional benefit, removing these substances also helps to keep the system’s RO membrane in good shape.
  • Stage 4: A semipermeable membrane separates all the harmful contaminants – think lead, arsenic, chromium, fluoride – from the water molecules.
  • Stage 5: The last stage is an activated carbon post-filter that eliminates any residual taste and odors right before the water comes out of the faucet.

The pressure at which this system can operate is between 40 and 80 psi. You don’t want to go above or below that range to ensure that the system functions as intended.

RO5DX Pros

What we like about the RO5DX is that it produces up to 50 gallons of pure H2O a day. This in combination with the large storage tank guarantees that your family has unlimited access to clean drinking water at all times.

And it doesn’t matter if you are on city or well water – or even want to use the system in your RV – you can always enjoy a relatively fast water flow.

The emergency leak stop detector brings peace of mind. It’ll shut off the water flow whenever it detects moisture.

More Pros:

  • You get an extra set of replacement filters for the first year.
  • You get a 1-year limited warranty.
  • You get lifetime expert support from certified water technicians.

Express Water RO5DX

The Express Water RO5DX – learn more on

System Installation

Express Water promotes the RO5DX by saying that there is no need to “waste money on professional installation – Our quick and easy to understand design means you can install and understand everything about your system “.

Quite frankly, we believe this to be only partly true.

On the one hand, we have a detailed instruction booklet that even offers colored illustrations and diagrams to aid you in the installation process. What’s more, we have a color matched quick connect system that tells you what hose goes where at a glance. Plus each connection that needs to be made is labeled on the unit itself.

On the other hand, we heard from a handful of customers that they experienced problems during the install, due to the “poor manual” with unclear directions and too many separate system components.

All in all, in our opinion, if you have the patience that’s required to set up this system, there’s no need to call for a plumber. Just don’t underestimate the scope of the project.

By the way, all adapters are included, so there’s no need for you to visit to the local hardware store.

We would usually provide our readers with a helpful installation video at this point, however, we couldn’t find one that features the Express Water RO5DX – sorry for that!

Parts List

  • RO module with double sealed filter housings and membrane housing
  • 4x filters
  • Extra set of replacement filters
  • RO membrane
  • Brass feed water adapter
  • Drain saddle
  • Water storage tank (3.2 gallons, white)
  • Tank stand
  • Tank valve
  • Leak stop valve
  • Faucet + adapter
  • Color-coded tubing
  • Filter housing wrench
  • Teflon tape

Filter/Membrane Replacements

Not much to say here. Filter changes are quick and easy. You can use the extra wrench to open the housings. But make sure to have a bucket at hand to prevent water spilling all over the floor.

Here’s how often you will have to change each filtration component as per manufacturer specifications:

  • Sediment pre-filter: About every 6 months
  • Carbon pre-filter: About every 6 months
  • GAC pre-filter: About every 6 months
  • RO membrane: Every 1 to 2 years
  • Carbon post-filter: About every 12 months

The good news is that you can get them at Walmart, Home Depot and a handful of other big retail stores located near you.

Annual replacement costs are reasonable. If you buy in bulk, you might be able to save a few bucks. And don’t forget that one set of replacement filters is already included in the package!


Here is a link to the official manual.

RO5DX Cons

Here is what we don’t like:

  • First of all, some customers have complained about missing parts upon delivery. At least the support team is quick to respond, which means that you should receive the parts 2-3 days later.
  • In addition, you have to exercise caution after the installation when turning on the water for the first time. Leaking valves and other connections are not uncommon. Make sure to seat the tubes fully into the fittings. At some point it seems to stop, but chances are that it isn’t far enough, so try to press a little harder.
  • The system is NSF Standard 58 certified. In other words, it fulfills the minimum requirements for point-of-use reverse osmosis systems designed to reduce contaminants that may be present in public or private drinking water. The only problem is that we couldn’t find specific details about reduction rates anywhere.

Express Water RO5DX Filter Review: Our Verdict + Best for

If you are on a budget, if you finally want to get access to clean drinking water, and if you want to save money with filter replacements, this RO filter system is best. Just be prepared to call for help when it comes to setting up the unit or fumble for a while to seal potential leaks.

Our verdict: 4.5 out of 5 stars!

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If you have any questions about the Express Water RO5DX or any other filter system really, please don’t hesitate to leave a comment below!

About the Author Alexandra Uta

Alex is a content writer with an affinity for research and a methodical attention to detail. Her writing interests have included many different topics, water treatment among them, which have encompassed varying writing styles.
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Leave a Comment:

darrin says December 9, 2019

Crazy how people say things about the instructions….its spelled out, word for word, along with detailed pictures…absolutely simple! Also search youtube, and can follow along step by step video on installation. If you cant install this unit, you probably arent smart enough to find this website in the first place

    Gene says December 9, 2019

    Thanks for sharing Darrin. This one got me laughing! 🙂

Sharon theil says March 3, 2022

How do you replace the minerals with this system?

    Gene says June 15, 2022

    Hi Sharon, there is no remineralization stage in the RO5DX.

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