APEC ROES-50 vs Waterdrop G3P600
On certification the G3P600 is the stronger system. Its IAPMO listings name fluoride, lead and PFOA/PFOS, while the APEC ROES-50's WQA listing names TDS and nothing else. The APEC has two things going for it: it runs on house pressure with no outlet, and its replacement filters cost less per year at APEC's own prices. Choose the G3P600 if you want those contaminants covered by a certification and have power under the sink. Choose the APEC if lower TDS is the goal, there is no outlet, and a 4 gallon tank fits in the cabinet.
What the registries list
We read both systems' records in the certifiers' own directories on 3 October 2026. Only the substances named in a listing count here; a maker's own lab claims do not.
| Standard | APEC ROES-50 | Waterdrop G3P600 |
|---|---|---|
| NSF/ANSI 58 (reverse osmosis) | TDS only | TDS, fluoride, cadmium, barium, radium 226/228, lead |
| NSF/ANSI 53 (health effects) | No listing | PFOA/PFOS |
| NSF/ANSI 42 (taste and odor) | No listing | Chlorine, taste and odor |
| NSF/ANSI 372 (lead-free materials) | No listing | Listed |
| Fluoride | Not certified | NSF/ANSI 58 |
| Lead | Not certified | NSF/ANSI 58 |
| PFOA/PFOS | Not certified | NSF/ANSI 53 |
The APEC record is narrower than the name on the box suggests. WQA's NSF/ANSI 58 listing for APEC covers several models, and the RO-90, RO-Hi and RO-PH90 carry fluoride, lead, arsenic and more, but the ROES-50 line carries only TDS. Waterdrop's own product page lists NSF/ANSI 42, 58 and 372; the NSF/ANSI 53 listing for PFOA/PFOS sits in the IAPMO directory under the WD-G3P600 model number. For the APEC on its own, see our APEC ROES-50 review; for the Waterdrop, the Waterdrop G3P600 review.
Tank vs tankless
| APEC ROES-50 | Waterdrop G3P600 | |
|---|---|---|
| Design | Storage tank, automatic shut-off | Tankless, pump filters on demand |
| Rated production | 50 GPD at 60 psi, 30 GPD at 50 psi | 600 GPD |
| Storage | 4 gallon tank, 11 x 11 x 15 in | None |
| System size | 15.5 x 5.25 x 17 in, plus the tank | 18.11 x 5.67 x 17.73 in |
| Feed water pressure | 40 to 85 psi | Product page cites 14.5 to 87 psi as its noise-test condition |
| Power | No power adapter in the box | Required, adapter included |
| Pure to drain | Not stated on the product page | 2:1 |
| Stages | 5 | 8 |
| Warranty | Not stated on the product page | 1 year |
A tank system makes water slowly and keeps a reserve. The ROES-50's 4 gallon tank never holds 4 gallons of water: APEC's own table for its 4 gallon tank gives 2.8 gallons at 40 psi of house pressure and 3.2 gallons at 60 psi. Once that is used, the reserve refills at the system's production rate, and APEC rates that lower when house pressure is lower. Our RO tank pressure page covers the air charge and why a tank stops filling.
The G3P600 has no reserve to run out of. Its pump pushes water through the membrane when you open the faucet, and IAPMO records a daily production rate of 2,715 liters for it in the NSF/ANSI 58 listing. The cost is a power cord under the sink and a bigger box in place of the tank. Other tankless units are compared in best tankless reverse osmosis systems.
Replacement filters and cost per year
Filter prices and schedules below are the makers' own, from their sites on 26 October 2026. The yearly figure is our arithmetic from those numbers. Prices on Amazon and elsewhere can differ.
| APEC ROES-50 | Waterdrop G3P600 | |
|---|---|---|
| Pre-filters | Set of 3, $29.95, every 6 to 12 months | G3-N1CF, $29.99, 6 months or 550 gal |
| Carbon block | In the pre-filter set | G3-N3CB, $29.99, 12 months or 1,100 gal |
| Membrane | In the complete set ($79.99), every 2 to 4 years | G3P600-RO, $109.99, 24 months or 2,200 gal |
| Per year, short schedule | About $85 (pre-filters every 6 months, complete set every 2 years) | About $145 (2 x G3-N1CF, 1 x G3-N3CB, half a membrane) |
| Per year, long schedule | About $42 (pre-filters yearly, complete set every 4 years) | No longer interval: Waterdrop rates each cartridge at up to the times above |
How the APEC figures add up: over two years on the short schedule you buy three pre-filter sets and one complete set ($89.85 + $79.99 = $169.84), which is about $85 a year. Over four years on the long schedule it is again three pre-filter sets and one complete set, about $42 a year. The G3P600 total assumes the time limits arrive before the gallon limits; a household drawing more than about 1,100 gallons a year through the RO faucet changes cartridges sooner, since each one is rated at that pace (550 gallons per 6 months, 1,100 per year, 2,200 per two years). Which cartridge is due when is covered on our RO replacement filters page.
Installation
Both are under-sink systems with their own RO faucet and a drain saddle in the box, so both need a place for the faucet on the sink or countertop and a connection to the drain pipe. If your sink has no spare hole, that means drilling one, which matters if you rent. APEC's box adds a feed water valve and a tank ball valve. Waterdrop's adds a power adapter and a feed water adapter, and the G3P600 needs an outlet within reach under the sink. The APEC needs room for the tank as well as the filter unit.
Which to choose
Choose the Waterdrop G3P600 if you want fluoride, lead and PFOA/PFOS reduction backed by a listing, you refill bottles or cook with a lot of filtered water, and there is an outlet under the sink.
Choose the APEC ROES-50 if lower TDS is what you are after, the cabinet has room for a tank, and you would rather not run power under the sink. It also has the lower filter cost of the two at the makers' prices.
Neither fits a rental where drilling is off the table. For that, see water filters for apartments.
FAQ
Which one is certified for more contaminants?
Does the APEC ROES-50 need electricity?
Which is cheaper to run?
Can I add a storage tank to the G3P600?
Do either of them add minerals back?
Sources
- APEC ROES-50, NSF/ANSI 58 (TDS only): WQA record (read 3 October 2026).
- Waterdrop G3P600, NSF/ANSI 58: IAPMO record (read 3 October 2026).
- Waterdrop G3P600, NSF/ANSI 42: IAPMO record (read 3 October 2026).
- Waterdrop G3P600, NSF/ANSI 53 (PFOA/PFOS): IAPMO record (read 3 October 2026).
- Waterdrop G3P600, NSF/ANSI 372: IAPMO record (read 3 October 2026).
- APEC Water Systems: ROES-50 specifications, pre-filter set for Essence systems, FILTER-MAX-ES50 complete set, 4 gallon tank.
- Waterdrop: G3P600 specifications and replacement filters, WD-PMT pressure tank.
- Maker pages read 26 October 2026.