Waterdrop G3P600 Reverse Osmosis System Review

With a production capacity of 600 gallons per day and a 2:1 low-drain ratio, this RO system efficiently delivers filtered water while minimizing waste, making it one of the more eco-conscious choices in its class. The tankless design of the Waterdrop G3P600 Reverse Osmosis System allows for purified water on demand, eliminating the need for a bulky storage tank. Its overall filtration is top-tier, leaving our testers without any major concerns about its abilities.

The big draw here is how much space it saves versus other RO systems. It still takes up room, but you don't need to sacrifice your entire under-sink storage area for this unit. If you're looking for powerful filtration that fits neatly under your sink and keeps you informed about water quality, this system has you covered.

PFAS Forever Chemical Removal

We were really impressed with its lab test results for PFAS forever chemical removal — it removed 100%! We've had a lot of contenders pass the 90% mark during testing, but a complete removal was exciting to see.

Critical Contaminant Removal

The Waterdrop G3P600 Reverse Osmosis System also earns a perfect score from our testers when it comes to critical contaminant removal. The 8-stage filtration system is highly effective, reducing nearly all major contaminants to undetectable levels. Lead, arsenic, chlorine, and a wide range of other chemical and physical contaminants are removed with exceptional efficiency. “If you have concerns about any critical contaminants, definitely look this way,” wrote one tester.

Fluoride gets reduced quite a bit — it hit 85% removal in our super-contaminated samples. It'll always be at safe levels, but it won't disappear entirely even when filtering normal city water levels. If you're obsessed with zero fluoride, this might not hit for you.

Heavy Metal and Trace Element Removal

Heavy metals like copper, cadmium, and barium are effectively removed, with the system performing near the top of all RO systems we tested. Trace elements such as selenium may be slightly impacted under extreme water conditions, but with normal tap water, this is a non-issue.

The system's alkaline stage slightly reintroduces minerals for taste, which may account for negligible residual readings of certain elements. Overall, it's a top-tier performer for heavy metals and trace elements, suitable for most household water supplies.

Taste

Users consistently report crisp tasing water without chlorine and other off-flavors. Coffee and tea taste noticeably better according to some reviewers, and the alkaline remineralization helps achieve a smooth, natural flavor. Some users note a brief plastic taste on first use or minor variations during the initial flush, but those issues fade away after prolonged use.

Maintenance and Setup

Installation is straightforward but requires some space, basic DIY skills, and under-sink electricity. Quick-connect fittings simplify connections, and the tankless design makes filter swaps faster than most other RO systems. The system's smart faucet and TDS display make monitoring easy, but installation can be tricky in tighter cabinets.

Depending on your renovation and plumbing skills, you might want to contract a professional to get a clean installation of this system.

Operating Cost

Filter replacement costs are higher than typical pitcher-style systems and even some other RO units, but the tankless design and long filter lifespan partially offset these expenses. The RO membrane lasts up to 24 months, pre-filters up to 6–12 months, and carbon blocks up to a year. Filter replacements over five years will cost about $590, according to our math.

Should You Buy The Waterdrop G3P600 Reverse Osmosis System?

The Waterdrop G3P600 is a solid choice for anyone who wants top-tier water quality without taking up a ton of under-sink space. Its tankless design, built-in TDS monitor, and 8-stage filtration make it ideal for households focused on convenience and clean water. Keep in mind, installation requires electricity and some setup effort, and filter replacement costs are higher than traditional RO systems, so it's not the best fit for someone looking for a plug-and-play, budget-friendly option. It's also a bit more expensive in the long-term cost compared to other RO systems with similar filtration strength.

What Other Water Filters Should You Consider?

If you're looking for similar high-performance filtration but don't mind a tank, the iSpring RCC7AK offers strong contaminant removal with an alkaline remineralization stage. You should also take a look at the APEC ROES-50 Essence Series — this was our Top Pick for Best Reverse Osmosis System for its nearly flawless filtration and long-term costs versus other RO systems.