The Waterdrop G3P600 is a Reverse Osmosis System tankless, 8-stage RO system designed to provide clean drinking water directly from under your sink. With NSF/ANSI 42, 58, and 372 certifications, it removes contaminants like lead, chlorine, fluoride, heavy metals, and more. This model includes a smart LED faucet, a 2:1 pure water to drain ratio, and a space-saving design perfect for modern kitchens.
In this review, we’ll break down the key features, performance, and whether the G3P600 is a good investment for your home in 2025.
Key Features
- 8-stage deep filtration for cleaner, better-tasting water
- Tankless design saves space under the sink
- 2:1 pure water to drain ratio – more efficient than standard RO systems
- NSF/ANSI 42, 58, and 372 certified
- 600 GPD flow rate – fills a glass of water in seconds
- Smart LED faucet shows filter status and water quality
- Easy filter replacement with twist-and-pull cartridges
- Quiet operation with built-in pump
- Under sink installation with compact footprint
Filtration and Certifications
The G3P600’s 8-stage filtration system removes a wide range of contaminants:
- Sediment
- Chlorine
- Lead
- Fluoride
- Heavy metals
- Nitrates
- VOCs
- PFAS
NSF/ANSI Certifications:
- NSF 42 – Chlorine, taste, and odor reduction
- NSF 58 – Reverse osmosis performance
- NSF 372 – Lead-free components
These certifications provide verified third-party assurance that the system works as advertised.
Tankless Design
- Traditional RO systems use storage tanks that can take up space, harbor bacteria, and delay water flow. The G3P600 is tankless, meaning:
- Fresh water is filtered on demand
- No risk of stagnant water
- Less maintenance and faster water delivery
- Slim design saves cabinet space
This makes it an ideal choice for small kitchens or homes with limited under-sink storage.
Smart LED Faucet
The included stainless steel smart faucet features an LED ring that shows:
- Filter life status (color-coded alerts)
- TDS level (Total Dissolved Solids)
- Water dispensing activity
The LED display makes it easy to monitor the filter condition and water quality without checking under the sink.
Efficiency: 2:1 Pure to Waste Ratio
One of the standout features is the 2:1 pure to drain ratio. Most RO systems waste 3–4 gallons for every 1 gallon of filtered water. The G3P600 only wastes 1 gallon for every 2 gallons of clean water, which:
- Reduces water bills
- Conserves water
- Improves overall system efficiency
This is especially important in areas where water conservation is a concern.
Water Flow Rate
With a 600 GPD (gallons per day) capacity, the G3P600 offers fast flow for:
- Filling bottles
- Cooking
- Making coffee or tea
- Washing produce
You won’t have to wait minutes to fill a pitcher. It takes only 10–12 seconds to fill a standard 8 oz glass.
Filter Life and Replacement
Filter replacement is simple thanks to the twist-and-pull design. The filters last:
- CF (composite filter): 6 months
- RO membrane: 24 months
- CB (carbon block): 12 months
You can check filter life through the faucet’s LED or the Waterdrop app (optional). Replacements are available on Amazon and through Waterdrop’s website.
Installation and Maintenance
The system comes with:
- RO unit
- Smart LED faucet
- Tubing and connectors
- User manual and installation guide
Most users install it in under 1–2 hours, even with minimal plumbing experience. The quick-connect fittings simplify the setup process. No plumber is required, though hiring one can help if your current under-sink layout is tight.
Pros
- Removes a wide range of harmful contaminants
- Certified by NSF for safety and effectiveness
- Tankless design saves space and delivers fresh water
- Smart LED faucet gives real-time filter info
- Easy to install and maintain
- 2:1 water efficiency is better than most RO systems
- Fast water flow – suitable for everyday use
- Quiet pump operation
Cons
- Higher upfront cost than basic RO units
- Only works with cold water inlet
- Requires access to a power outlet under the sink
- Not suitable for well water without pre-filtration
- Not Wi-Fi connected unless paired with Waterdrop app manually
Who Should Buy It
The Waterdrop G3P600 is best for:
- Homeowners who want clean, great-tasting water
- Families who use filtered water for cooking and drinking daily
- People living in small apartments or tight kitchen spaces
- Environment-conscious users who want to reduce water waste
- Anyone looking for a certified, modern RO system with a sleek design
It’s not the right pick for rural homes using untreated well water, unless used with pre-filters or UV stages.
What Customers Say
Verified reviews highlight:
- “Installation was easy. The faucet looks modern, and the water tastes great.”
- “Love the fast flow and quiet pump.”
- “The LED faucet is very helpful. I know when to change filters instantly.”
- “Big upgrade from my old tank system.”
A few customers mention the price, but agree it’s worth it for the long-term value and convenience.
Final Verdict
The Waterdrop G3P600 Reverse Osmosis System offers clean, filtered water in a modern, tankless design. It’s built for people who want better water quality without giving up cabinet space or wasting water. With NSF certification, strong filtration, easy maintenance, and a smart faucet, this is one of the best under-sink RO systems for home use in 2025.