The Waterdrop G3P600 is one of the best tankless RO systems for households that want under-sink space back. NSF 58, 42, and 372 certified, with SGS third-party testing supporting reduction of PFAS, fluoride, and heavy metals. The 2:1 pure-to-drain ratio and 600 GPD output put it well ahead of traditional tank systems on efficiency. The smart faucet with TDS display is a genuine differentiator. Main trade-offs: higher upfront cost than the APEC ROES-50, no remineralization, and some users report pump noise. For households that value space-saving and water efficiency over lowest upfront cost, it's a strong choice.
- NSF 58 fluoride removal verified
- Tankless - saves space
- 600 GPD - 12x faster than APEC
- TDS display confirms filtration
- Higher cost (Premium tier)
- Requires electricity
- No remineralization
NSF certification - what's verified
The G3P600 carries three NSF certifications. NSF 58 is the core RO standard - it independently verifies that the RO membrane reduces TDS and specific contaminants. NSF 42 covers chlorine taste and odor. NSF 372 certifies lead-free materials. Additionally, SGS third-party laboratory testing supports reduction of PFAS (PFOA/PFOS), chromium, fluoride, arsenic, radium, iron, calcium, chloride, and radioactive substances. The IAPMO R&T certification body conducted the NSF testing - the same body used by Aquasana and other premium brands.
Performance - tankless vs traditional RO
The G3P600's primary advantage over systems like the APEC ROES-50 is its tankless design. Traditional RO systems store filtered water in a 3-4 gallon pressurized tank - taking up significant under-sink space and requiring refill time after heavy use. The G3P600 filters on demand, driven by a pump, delivering 600 GPD. No waiting, no tank, more cabinet space.
The 2:1 pure-to-drain ratio means for every 2 gallons purified, 1 gallon goes to drain - significantly more efficient than traditional tank systems which typically run 3:1 or worse. For a family drinking roughly a gallon a day, that difference adds up to meaningfully less wasted water per year compared with a traditional system.
Smart faucet - TDS display
The included LED smart faucet displays real-time TDS levels and filter life. TDS (total dissolved solids) is a proxy measure for overall filtration effectiveness - lower TDS means more contaminants removed. The filter life indicator tells you when to replace without guessing. This is a useful feature missing from most competitor systems including the APEC ROES-50. Filter replacement takes seconds with a twist - no tools, no turning off the water supply.
G3P600 vs APEC ROES-50 - which to choose
| Feature | Waterdrop G3P600 | APEC ROES-50 |
|---|---|---|
| Price tier | Premium | Budget |
| NSF certs | 58, 42, 372 | 58, WQA |
| Tank | Tankless | 3.2 gal tank |
| Capacity | 600 GPD | 50 GPD |
| Drain ratio | 2:1 | 3-4:1 |
| Smart faucet | TDS display | Basic faucet |
| Remineralization | No | No |
| Running cost | Mid | Low |
| Country | China (US sold) | USA assembled |
Choose APEC ROES-50 if: budget is the priority, you don't mind the under-sink tank, and lowest annual running cost matters. It's one of the best-value certified RO systems available.
Choose Waterdrop G3P600 if: under-sink space is limited, you want faster flow, the 2:1 water efficiency matters, and you want a smart faucet with TDS monitoring built in.
Installation
The G3P600 requires drilling two holes - one for the RO faucet (1 inch) and one for the drain connection. This is standard for under-sink RO systems. Total installation time is approximately 30-45 minutes with basic plumbing comfort. One notable requirement: the G3P600 needs electrical power under the sink to run its pump - most under-sink cabinets have an outlet, but verify before ordering. The APEC ROES-50 does not require electricity.