Waterdrop G3P600 Tankless Reverse Osmosis System (600 GPD) review
Under-sink reverse osmosis. Plumber recommended if you are not comfortable with a drain saddle and a tank. Not a whole-house solution. Listed to IAPMO/ANSI 58, IAPMO/ANSI 42.
What it removes
| Contaminant | Evidence | Stated reduction | Scope |
|---|---|---|---|
| Cadmium | Certified | not stated | |
| Chromium (total) | Certified | not stated | hexavalent |
| Total Dissolved Solids | Certified | not stated | |
| Fluoride | Certified | not stated | |
| Selenium | Certified | not stated | |
| Chlorine (residual) | Certified | not stated | |
| PFOA | Manufacturer-reported | 99% | |
| PFOS | Manufacturer-reported | 99% | |
| Arsenic | Manufacturer-reported | not stated | |
| Lead | Manufacturer-reported | not stated | |
| Nitrate (as N) | Manufacturer-reported | not stated | |
| Radium 226 + 228 | Manufacturer-reported | not stated |
Certified is an NSF, WQA, or IAPMO listing for that claim.
One drinking-water tap. Not a whole-house solution.
Certifications
- IAPMO/ANSI 58: TDS Reduction (from the manufacturer's page, not yet checked against the certifier's database)
- IAPMO/ANSI 58: Cadmium Reduction (from the manufacturer's page, not yet checked against the certifier's database)
- IAPMO/ANSI 58: Chromium (Hexavalent) Reduction (from the manufacturer's page, not yet checked against the certifier's database)
- IAPMO/ANSI 58: Selenium Reduction (from the manufacturer's page, not yet checked against the certifier's database)
- IAPMO/ANSI 58: Fluoride Reduction (from the manufacturer's page, not yet checked against the certifier's database)
- IAPMO/ANSI 42: Chlorine Reduction (from the manufacturer's page, not yet checked against the certifier's database)
Tankless, pump-driven, requires outlet; 2:1 pure-to-drain; 8-stage (CF pre-filter, CB carbon, RO membrane). Filter lives: CF 6 mo/550 gal ($29.99), CB 12 mo/1,100 gal ($29.99), RO 24 mo/2,200 gal ($109.99); annual_replacement_cost est. $144.97 (matches Waterdrop's stated average annual cost). Certified by IAPMO R&T (not NSF International) against NSF/ANSI 42 & 58 and 372 per the WD-G3P600 Performance Data Sheet; PDS also shows testing (not certification) to NSF/ANSI 53 VOC surrogate and 401. Not found in NSF's own listing database (searched Waterdrop/G3P600/WD-G3 for 42/53/58/372 on 2026-09-14). Arsenic and lead are listed as reduced but no model-specific % is on the manufacturer page or IAPMO PDS. Amazon price $439.00 (list $539) on 2026-09-14.