WaterFilterComparisons’ Review

If you’re looking for a sleek, under-sink water filter that won’t slow you down, the Waterdrop G2P600 might catch your eye. It’s a 7-stage reverse osmosis system with a fast 600 GPD flow rate, compact tankless design, and even includes a remineralizer to improve taste. On paper, it sounds like a great fit for anyone who wants clean water without a bulky setup.

But once we dug into the details, we found a few important drawbacks — especially when it comes to certifications and long-term peace of mind. In this review, we’ll walk through the pros and cons to help you figure out if the G2P600 is the right system for your home, or if there are better options to consider.

Product Specs

• Size: 18” D x 6.4” W x 16” H
• Capacity: 600 gallons per day (GPD)
• Filtration Technology: 7-stage filtration with a 0.0001-micron RO (MRO) membrane
• Contaminants Addressed: Fluoride, chlorine, lead, PFAS, heavy metals, TDS
• Certifications: System certification NSF/ANSI Standard 372, individual filters are certified by SGS and CSA to NSF/ANSI Standards 42, 53, 58, and 401
• Remineralizer: Yes, adds calcium and magnesium
• Installation: DIY-friendly
• Warranty: 1-year limited

Performance

On paper, the Waterdrop G2P600 offers strong performance for a mid-range RO system featuring 7-stage filtration, high 600 GPD flow rate, and an efficient 1.5:1 drain ratio.

The G2P600 starts with a CF filter that reduces rust, sediment, organic matter, and chlorine using a sediment membrane and carbon block. It’s followed by a composite RO filter with multiple layers, including a 0.0001-micron membrane, to tackle fluoride, PFAS, TDS, nitrates, and heavy metals. The system also includes a remineralizer, which adds calcium and magnesium to improve taste and balance pH.

That said, the effectiveness of the system depends heavily on how much you value third-party validation. While the filters themselves are certified to reduce key contaminants, there’s no full-system certification confirming that everything works together as intended in real-world conditions. For buyers who care about verified protection, that’s a significant concern.

Certifications

Here’s where things get a little tricky. The filters used in the G2P600 are certified to NSF/ANSI Standards 42, 53, 58, and 401 by the third-party testing groups SGS and CSA. These certifications confirm that the individual filters can reduce certain contaminants like chlorine, lead, PFAS, and even pharmaceuticals.

However, the system itself is only certified as a complete unit to NSF/ANSI Standard 372 for the use of lead-free materials — meaning there’s no confirmation that the fully assembled system performs to the other standards in a real-world setting.

That’s better than nothing, but still not as reassuring as systems that go through end-to-end testing to NSF/ANSI Standards.

Remineralizer

Yes, the G2P600 includes a built-in remineralization filter that adds calcium and magnesium to the water. This not only improves taste but also helps balance the pH, which is often slightly acidic after reverse osmosis filtration. It’s a small touch that makes the water feel more natural and palatable.

Limitations

The most notable limitation with the G2P600 is the lack of full-system certification. While the filters are certified for performance, there’s no third-party validation that the system as a whole delivers on its promises. That’s a concern, especially for households dealing with serious water quality issues where proven contaminant reduction is critical.

Installation and Maintenance

Installation is fairly simple and should be manageable for most DIYers. The push-to-connect fittings and labeled tubing make the setup process straightforward, and replacing filters doesn’t require any tools.

Basic Installation Steps

1. Shut off water supply and disconnect cold water line
2. Install feed water adapter and connect tubing
3. Mount the system under the sink
4. Attach tubing to faucet and drain
5. Restore water supply, flush the system, and check for leaks

Replacing filters is simple: just twist the old cartridge counterclockwise to remove it and snap the new one into place. The system features indicators to tell you when it’s time to swap filters, with the CF pre-filter requiring a change every 12 months and the MRO composite filter needing a replacement every 24 months.

Pros and Cons

Here are a few pros and cons of the system, based on our evaluation and feedback from other users.

Pros

• Fast 600 GPD flow rate
• Space-saving tankless design
• Built-in remineralization stage
• An indicator to tell you when it’s time to replace filters
• Easy installation and maintenance

Cons

• The system is certified to NSF/ANSI Standard 372 (lead-free materials), but the other certifications only apply to the individual filters
• Some users reported that the system is noisier than expected

Summary

The Waterdrop G2P600 checks a lot of boxes on paper: fast filtration, modern design, and a solid list of contaminants that its certified filters can handle. But if you’re someone who wants full confidence in a system’s performance, the lack of complete system certification is hard to ignore.

We like the direction Waterdrop is going with this system, but we recommend options that have been tested and certified from end to end. If you’re looking for that extra layer of assurance, systems like the SmartFlow® Reverse Osmosis offer more robust certifications at a better price and a longer warranty.

Want to see which systems made our top picks? Check out our guide to the Best Reverse Osmosis Systems.