10 Best Waterdrop Reverse Osmosis Water Filters 2025 in the United States

The Waterdrop X16-Alkaline is a powerful under-sink reverse osmosis (RO) water filter designed for those who want high-quality purified water quickly and without a bulky tank. It uses an 11-stage filtration system with a reinforced 0.0001 micron RO membrane, effectively removing many common contaminants like chlorine, fluoride, lead, and harmful chemicals. This makes it a great choice for anyone needing clean, safe drinking water. One standout feature is its tankless design, which saves space and offers an impressive water output rate of up to 1600 gallons per day—fast enough to fill a small cup in about 2 seconds. This is much quicker than many traditional RO systems that use storage tanks. The system also includes an alkaline mineral filter that slightly raises the water's pH to about 7.5, mimicking natural spring water taste and promoting a smoother, healthier drinking experience. It’s certified by trusted organizations, giving confidence in its contaminant removal claims.

Installation is fairly straightforward but does require drilling a hole for the stainless steel faucet, which might need some basic DIY skills or professional help. Maintenance is simplified with real-time monitoring of filter life and water quality through an intelligent digital faucet, so you know exactly when to replace filters. The system is also eco-friendly, boasting a 3:1 pure-to-drain water ratio that conserves water compared to many older RO units. However, it is relatively heavy and larger than some compact models, so ensuring you have enough space under your sink is important. Also, while the alkaline feature adds healthy minerals, it may slightly increase total dissolved solids (TDS), which some users might notice.

This water filter suits users looking for fast, mineral-enhanced, and highly purified water with smart features, especially where space-saving and eco-friendliness are priorities.

The Waterdrop G3P600 is a tankless reverse osmosis water filter that offers an advanced 8-stage filtration process certified to remove a wide range of contaminants like chlorine, fluoride, heavy metals, and even radioactive substances. This makes it a strong choice for users concerned about water safety and taste. Its tankless design saves significant under-sink space compared to traditional systems with tanks, which is great if your kitchen cabinet is limited.

The 2:1 water waste ratio is better than many RO systems, meaning less water is wasted during filtration. It can produce up to 600 gallons of clean water daily with a steady flow rate, filling a glass in about 8 seconds, which is convenient for daily use. The smart LED faucet is a helpful feature, showing real-time water quality and filter life, so you know when it’s time to replace filters—maintenance is simple and tool-free.

The system requires an electrical connection under the sink, which might not suit all setups, and it’s relatively large (about 18" x 6" x 18"), so measuring your cabinet space beforehand is important. Also, while it excels at filtering tap water, it’s not recommended for well water due to clogging risks. If you want a modern, efficient, and space-saving RO system with easy monitoring and strong contaminant removal, the Waterdrop G3P600 is a solid option to consider.

The Waterdrop G5P700A is an 8-stage reverse osmosis (RO) system that thoroughly filters out a wide range of contaminants including lead, fluoride, heavy metals, chlorine, and even tiny particles as small as 0.0001 microns. It also adds beneficial minerals like calcium and magnesium back into the water, improving taste and health benefits. One strong point is its tankless design, which saves up to 70% of under-sink space compared to traditional tank systems, making it a great choice for kitchens with limited room.

The system’s water output is impressive at 700 gallons per day, ensuring fast access to purified water—about 6 ounces every 6 seconds. It achieves an efficient 2:1 pure-to-drain ratio, which means less water waste than many conventional RO systems, helping both your water bill and the environment. The smart LED faucet adds a modern touch but requires drilling into your countertop for installation, which might be a barrier for some users or renters.

Weighing about 21 pounds and with compact dimensions, the unit is manageable for most household setups. This system suits anyone wanting high-capacity, space-saving, and thorough water purification with the added benefit of mineral enhancement, though installation may require some effort.