Express Water ROALK5D Reverse Osmosis Alkaline Water Filtration System Review

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Are you in the market for a water filtration system that will stop your water from tasting funny and help make your water healthier? If so, look no further because we have an excellent under-sink RO filter that mineralizes your water as it cleans it.

Express Water ROALK5D Reverse Osmosis Alkaline Water Filtration System

51ued95m42L. SL500

The Express Water ROALK5D RO Filtration System is a high-end yet affordable under-sink water filtration system that uses reverse osmosis and more.

Who is This Product For?

The Express Water ROALK5D RO Filtration System is for anyone who wants clear, clean, and odorless drinking water full of healthy minerals but free of contaminants and toxins.

What’s Included?

When you purchase the Express Water ROALK5D RO Filtration System, you get a steel water tank, the connection hardware, the mounting hardware, all of the filter housings, and yes, the filter media too. You also get a designer faucet, as well as the instructions and a one-year warranty.

Overview of Features

The standout feature of the Express Water ROALK5D RO Filtration System is the ten-stage filter. Yes, that’s right – ten stages. Let’s look at each of these filtration stages to see what they’re all about.

The first stage consists of a sediment filter that removes dirt, dust, sand, rust, and other solid particles from the water, thus increasing the lifespan of the rest of the filter while also protecting your pipes, fixtures, and hardware from damage and clogging.

The second and third stages are carbon blocks and granular carbon filters. These remove various pollutants like volatile organic compounds, chlorine, and other odor-causing substances from the water.

The fourth stage is the reverse osmosis membrane, which can remove the most stubborn substances from the water, things like lead, arsenic, chromium, fluoride, TDS, radium, and more.

Stages five through nine add minerals, antioxidants, and oxygen to the water, ensuring that your drinking water is as healthy as can be. The minerals are ionically activated, so they cause more minerals to adhere to them as they flow through the water.

The tenth and final filtration stage is a post-activated carbon filter to catch any remaining compounds, odors, and colors.

Next, installing the Express Water ROALK5D RO Filtration System is easy thanks to the quick-connect system that should easily connect to most fittings in just a few seconds. Overall, this unit is straightforward to install. Moreover, it does not require much maintenance either. A few filters have to be changed once per year, and others twice per year, which is not much.

The Express Water ROALK5D RO Filtration System has some other nifty features. It is double-sealed for greater water contact and more efficient filtration, something that also helps with cost-effectiveness. The leak stop valve is another good addition, something that causes this unit to automatically turn off when it detects a leak.

Let’s keep in mind that the Express Water ROALK5D RO Filtration System can filter about 0.8 gallons of water per minute, for a total of about 50 gallons per day; it’s not the fastest filter in terms of processing speed, but it gets the job done.


Although installing the Express Water ROALK5D RO Filtration System is not too difficult, there are quite a few components to deal with. If you need a bit of help, check out this tutorial video we have included.


  • 10 stages of filtration
  • Very efficient
  • Durable design
  • Easy installation
  • Easy maintenance
  • Prevents leaks from occurring


  • Only for a single sink
  • Pressure and flow rate are not fantastic


Express Water makes some great products, but unfortunately, the one we looked at today is only for single sinks. If you would rather have a water filtration system designed to cover the whole house, the Express Water Heavy Metal Whole House Water Filter is a model worth investigating.

On the other hand, if something like a small countertop water filter, like a super-advanced Britta filter, sounds right for you, check out the Apex Countertop Drinking Water Filter.


If a heavy-duty ten-stage water filtration system for a single sink sounds like something you want, the Express Water ROALK5D RO Filtration System is one of the best products to consider. This is full-scale water filtration at its finest.

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