U1 is 3rd party tested for the reduction of TDS, Fluoride, Lead, PFOA/PFOS, Hexavalent Chromium, and Trivalent Chromium.

The RKIN mobile app will be released on app stores when the pre-orders start shipping.

The RKIN app has the same functionality as the physical control panel. Checking water quality while away or even resetting the filter change notification is as simple as pressing a button.

You can also dispense water from U1-W remotely via the app. Why? Because you can.

9.5 Inches Wide, 17 Inches High, 19 Inches Deep, 26 lbs.

Dimensions with turntable(optional, not included): Turntable base - 21" round, Height 18.5"

U1 uses instant-hot technology. Hot water is immediately available even at boiling temperatures, limited only by a total system max volume of ½ gallon.

It takes about 15 minutes to cool 15 ounces of water at a time to 59F/15C. When the cold water button is pressed, U1 will display “COOL” once the water temperature has reached maximum cold or “PREP” if cooling is still in progress. No need to wait for the cooling process to complete; cold water can be dispensed at any time. Cold water temperature is not adjustable.

Yes, press and hold the “cold” water button for 5 seconds to turn off or turn the water cooler back on.

During our internal testing, we got negative ORP readings from -330 to -347 on average. Individual results may vary.

Yes, hydrogen production can be turned off or on with a press of a “hydrogen” button.

About ½ gallon of filtered water at a time. U1 filters ½ gallon of water in under 7 minutes. Twice as fast as Zero Installation Purifier. 

1 Gallon of water is loaded into the system. U1 makes ½ gallon of pure water and another ½ of a gallon of wastewater with all the impurities in it. Since wastewater contains all the impurities, it’s NOT recommended for consumption. However, it can be used to water plants, rinse vegetables, etc.

No, all the wastewater is deposited into a separate section of the supply tank and is no longer used for pure water production.

Please refer to the section below for all details on the replacement filters.

If you sign up for our filter subscription program during checkout, the replacement filters will be delivered to you every 12 months automatically. Otherwise, replacement filters can be ordered on our website or over the phone.

Yes, we designed our own filters to make filter changes as easy as possible with ¼ turn to remove and leak-free features.

3rd party tested for the reduction of TDS, Fluoride, Lead, PFOA/PFOS, Hexavalent Chromium, and Trivalent Chromium.

U1 uses a multi-stage reverse osmosis technology. Reverse osmosis is one of the best ways to purify water when it comes to cost per gallon, speed, and purity of the water. Undersink reverse osmosis water filters have been around for decades and have been extensively studied by the scientific community.

Because of U1’s unique design, preventing back-pressure within the RO membrane, it performs as well or better than most high-quality under-sink reverse osmosis systems.

The second stage - Carbon Block pre-filter alone tackles a multitude of contaminants even before they get to the reverse osmosis membrane.

But we understand that you may want to do your own research. So the fastest way to get an answer is to do an online search for "reverse osmosis removes XYZ" and review scientific papers. Replace "XYZ" with a contaminant of your choice. Or you can always contact our customer support here.

No, the current version is suitable for 100V-120V electric outlets only - USA, Canada, Mexico, Japan, etc. However, 3rd party 220V to 120V voltage converters can be used. Must be rated for 1500 W continuous power.

U1 will only display imperial units for temperature - Fahrenheit and ounces for water volume.

You can always call us at 1-800-803-4551 Monday through Friday, 9 AM-5 PM EST, or submit a request here.