

💦 Elevate your hydration game with pure, mineral-rich water on demand!
The Express Water Reverse Osmosis Alkaline Water Filtration System delivers up to 50 gallons per day of ultra-pure water by removing 99.99% of contaminants through a 10-stage filtration process. Featuring an alkaline filter that restores essential minerals, this compact under-sink system is NSF certified, easy to install without professional help, and includes a high-flow faucet and 4-gallon storage tank—perfect for health-conscious professionals seeking clean, great-tasting water at home or office.













| ASIN | B00MU20LN2 |
| Best Sellers Rank | #4,865 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #14 in Under-Sink & Countertop Filtration |
| Brand | EXPRESS WATER |
| Brand Name | EXPRESS WATER |
| Capacity | 50 G/day |
| Container Type | Tank |
| Customer Reviews | 4.5 out of 5 stars 2,542 Reviews |
| Global Trade Identification Number | 00705332529525 |
| Included Components | Alkaline Reverse Osmosis System |
| Installation Type | Under Sink |
| Item Dimensions L x W x H | 15"L x 5"W x 17"H |
| Item Weight | 29.5 Pounds |
| Manufacturer | Express Water |
| Material | Alloy Steel, Brass , Plastic |
| Material Type | Alloy Steel, Brass, Plastic |
| Maximum Flow Rate | 0.8 Gallons Per Minute |
| Model Name | ROALK5D |
| Model Number | ROALK** |
| Other Special Features of the Product | NSF certified |
| Power Source | Water Pressure |
| Product Dimensions | 15"L x 5"W x 17"H |
| Purification Method | Alkaline, Reverse Osmosis |
| Special Feature | NSF certified |
| Supported Water TDS Level Maximum (PPM) | 2000 |
| UPC | 705332529525 |
| Unit Count | 1 Count |
| Upper Temperature Rating | 100 Degrees Fahrenheit |
S**F
Amazing and affordable
Simple and amazing! I live in a city with awful water; it’s terrible quality, full of forever chemicals, and tastes like dirt. We were slaves to one-use water bottles until this easy solution. Installation is simple enough and the customer service was excellent when I had questions. I’m an advanced-beginner home DIY-er and with the videos and written instructions, I installed this over a few days taking about 2 hours each day. I took my time double checking everything at each step. I experienced no problems or leaks. I’ve had it installed and running for about 3 weeks now. I did a lot of research for which filter to use, both brand and type. RO with remineralization is the best way to go. This brand does it all and at a great price with easy self installation. I would recommend this to everyone, seriously. It does require a separate beverage faucet, which I thought I didn’t want at first. I thought wanted every drop of water in my kitchen sink fully filtered. But without pricey full-house filters, that can’t be achieved. This is a nice alternative that lets you keep water pressure for washing dishes. The beverage faucet itself has great flow rate. Size: I have a small amount of space under my cabinet because I have a large disposal underneath. It still fits beautifully and I even have space for a little bit of storage under the sink. I have a one drain sink with a disposal, and I had to buy a separate attachment to make sure the filter drains properly. A plumber gave me the attachment tip. We’ve been making ice and drinking clean, great tasting water and we’re so thankful for this affordable and amazing product. Get it.
G**A
Great ro system
Water quality is great and taste great, smaller than other ro systems, super good for the price, easy to install, I had it for almost 2 years and haven’t had any issues, no noise and very duarable
R**5
Easy instructions with pictures!
We love this system! Complete setup easily explained in book of instructions! Awesome price n water tastes so good we use it for cooking n icecubes! Price was fantastic n so far very pleased w the quality!
F**R
Love this filter kit.
Love this filter. Install was easy with the provided instructions. I have it hooked up to my ice maker as well. Water never looked so clean and tastes great!
A**E
Great value
I bought this system about midway through 2025 and have had zero issues with it. This does an excellent job of filtering out all the nasty particles and tastes from our city water. Hook up was very easy to install. Love this filtration system and it is very affordable.
B**.
Works well, costly upkeep
Works well, easy install. Filters way too expensive to replace, nearly as much as the whole system costs every six months
T**S
QUALITY Reverse Osmosis System
My husband installed this Reverse Osmosis System for our well water home. Although we have a water purification system, this help even more with the quality of drinking water. The system is heavy duty and came with the wrenches needed to tighten the canisters that hold the filters. It works great. Removes smells and metals.
M**Y
Good while it lasted...
*UPDATE* 4/26/21 So, I've had this thing for about a year now and it's been such a headache. I decided to change the filters, spent a couple hundred dollars on a few years of filters. I'm getting about 24oz of water now. It's ridiculous how much time and money I've spent on this thing for this amount of trouble it's giving me. I emailed the company and they gave me some steps to repressurize the tank to 10psi, after following those steps, it's actually made it worse. The water stays on for about 5 seconds, the tank does not fill. I haven't been able to use this thing for weeks. At this point I'm ready to give up and buy from a different company. I'll be sure to update this review if the company ever decides to rectify this situation. This thing is sweet, I got it because the our ground water is contaminated with PFOA and PFOS from fire fighting foam used by nearby military base for decades. It was pretty easy to install. I ended up having to buy some cobalt drill bits to drill a hole in my stainless steel sink to attach the faucet but other than that, it was a painless installation. Everything is color coded and makes it easy to find out what goes where. I did have an issue with shipping and they sent me a replacement. After I installed it, there was some leaking from the middle filter, I removed it, dried the O-Ring and reinstalled it and it hasn't leaked a drop since. It says 4 gallon water tank storage but I seriously doubt that, when I fill up my 5 gallon jugs, it get maybe 2.5 - 3 gallons before it turns to a trickle. The water itself tastes.. well.. tasteless because its water but it is very thirst quenching and most importantly, clean. I did not use a PPM or pH meter so I have no comment on that. I am satisfied with my purchase and if anything goes wrong I will be sure to update this review.
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