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Waterdrop X16 Review: Best high-flow undersink reverse Osmosis system

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Add The New York Post on Google Americans care about water purity, even if most are not aware of the major contaminants plaguing their drinking water.

Accessing purified water can quickly get expensive due to recurring subscription fees or inefficient filters that require frequent replacement. While built-in refrigerator dispensers and pitcher filters are common options, large families often need stronger purification and faster flow rates.

To address this gap, brands like Waterdrop have perfected reverse osmosis systems focusing not only on the purification process, but also convenience, design, and long-term upkeep costs.

Having previously tested the Waterdrop X12, I knew just how much these core principles guided the brand’s approach to innovation, especially for its line of under-the-sink reverse osmosis systems. So when I got the opportunity to test the X16, I wasn’t surprised to be once again impressed by their thoughtful attention to detail.

The X Series is Waterdrop’s premier line of under-sink reverse osmosis systems. Unlike most filtration systems, which use carbon and sediment filters to capture chlorine and other larger particles, Waterdrop’s reverse osmosis systems use a semi-permeable membrane that traps the aforementioned contaminants, as well as close to 99% of TDS (total dissolved solids) and PFAS forever chemicals (per- and polyfluoroalkyl substances), including fluoride and heavy metals.

The Waterdrop X16 is shown boxed. Al Murillo The X16 uses an eleven-stage filtration process that combines mesh filter cotton, carbon filtration, a 0.0001μm RO membrane and UV sterilization. In addition, a built-in LED function eliminates 99.9% of impurities in the water path. It’s no wonder the Waterdrop X16 has received NSF/ANSI 42, 58, and 372 certification from third-party testing for meeting official standards of taste, performance and lead-free material safety.

If you’re suddenly looking at the massive water tank and conjoined filters of your current under-sink system and wondering if it delivers the same level of purification, chances are it doesn’t.

Most filtration systems consume more water and take up significantly more space. Measuring 16.72 inches in height, 18.2 inches in depth and 6.25 inches wide, the Watertank X16’s tankless design helps consolidate space vertically, leaving considerable room for other necessities below your sink.

A Waterdrop X16 installation. (Al Murillo) Al Murillo Compared to traditional RO and filter systems, the X16 delivers a 3:1 pure-to-drain ratio, meaning the X16 produces 3 gallons of clean water for every 1 gallon of water drained as wastewater.

The savings are not financial through lower utility costs, but also environmental, with less water being discarded in the process. You’ll also find yourself not buying water bottles as much, while the 24-month lifespan of the RO membrane means minimal maintenance.

Like its predecessor, the X16 also comes with a sleek smart faucet that lets you select the desired water amount. The ounces are displayed directly on the faucet screen, as well as real-time TDS with every pour.

A Waterdrop X16 Faucet. Al Murillo Pros: Fast flow rate Excellent filtration Smart Faucet Tankless design Cons: On the expensive end Countertop installation might require professional assistance While you can sync the unit to the Waterdrop app to check on filter life status and receive helpful replacement reminders, the screen on the smart faucet will also alert you when it’s time to replace them.

The biggest improvement over previous models is the X16’s impressive rapid flow capacity of 1600 GPD (gallons per day). It is the fastest model that Waterdrop has made to date, able to fill up a 6-ounce cup within 2 seconds. You will especially appreciate the speed, the adjustable volume control, and the one-touch feature on busy mornings when you have to fill up not only the essential coffee pot, but the many water bottles for everyone’s day.

The Waterdrop X16 Unit and accessories. Al Murillo Thanks to the easy-to-follow instructions and the included supplies, installing the Waterdrop X16 is simple. However, since the smart faucet requires countertop installation, professional assistance might be necessary.

The Waterdrop X16 Installation Part II. Al Murillo Is it worth it? The final verdict For large households, the Waterdrop X16 stands out as the best reverse osmosis under-sink system. Its impressive flow rate is a game-changer for busy families who want to streamline how they get their water, while the1600 GPD capacity keeps long-term utility expenses low. Along with its energy-saving features that reduce operational noise and cut power consumption by 40 percent, the X16 makes for an ideal, eco-friendly choice for sustainable living and those who prioritize clean water.

For over 200 years, the New York Post has been America’s go-to source for bold news, engaging stories, in-depth reporting, and now, insightful shopping guidance. We’re not just thorough reporters – we sift through mountains of information, test and compare products, and consult experts on any topics we aren’t already schooled specialists in to deliver useful, realistic product recommendations based on our extensive and hands-on analysis. Here at The Post, we’re known for being brutally honest – we clearly label partnership content, and whether we receive anything from affiliate links, so you always know where we stand. We routinely update content to reflect current research and expert advice, provide context (and wit) and ensure our links work. Please note that deals can expire, and all prices are subject to change.

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