The Waterdrop G5P700A is, in essence, a G3P600 with two upgrades: built-in alkaline remineralisation (so the water doesn’t taste flat) and a slightly faster 700 GPD flow. If the one thing putting you off reverse osmosis is the “empty” taste of pure RO water, this is the Waterdrop that solves it. Here’s our research-based take.
Who is this for?
The G5P700A suits a medium-to-large UK household that wants RO water with a fuller taste. The alkaline stage adds calcium and magnesium back after filtration, giving a rounder flavour closer to good bottled water — the same trick the Frizzlife PD600 uses. The extra flow also helps if several people draw water through the day.
If you don’t care about remineralisation, the G3P600 does the same core filtration and adds NSF/ANSI 42 certification the G5P700A lacks — though it often costs a little more.
Key specs
| Waterdrop G5P700A | |
|---|---|
| Flow rate | 700 GPD |
| Filtration | 8-stage tankless RO + alkaline |
| Remineralisation | Yes (alkaline mineral) |
| RO membrane life | 24 months |
| Filters to change | Just 2 |
| Warranty (UK) | 1 year |
| UK price | ~£299 (from £289.99 at UK retailers) |
What it removes
The G5P700A reduces up to 99% of common contaminants — TDS, chlorine, fluoride, PFAS and heavy metals — then adds minerals back for taste. It’s certified to NSF/ANSI 58 (TDS reduction) and 372 (lead-free materials). One honest gap: unlike the G3P600, its listings don’t cite NSF/ANSI 42 (chlorine taste & odour). In practice it reduces chlorine well, but if maximum certified coverage matters to you, note the difference.
UK hard-water performance
In hard-water areas like London (~280 mg/L), the G5P700A strips the dissolved minerals behind limescale, then the alkaline stage reintroduces a measured amount for taste — a sensible balance for hard-water homes that find pure RO too soft. Expect the pre-filter to need changing toward the shorter end of its life in very hard water.
Installation
Standard under-sink RO install: cold-feed connection, drain to waste, and a 13A socket under the sink. At eight stages in one tankless unit it’s still compact for UK cabinets. A competent-DIY job; budget for an electrician if you lack a socket.
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With only two filters to change (pre-filter ~6 months, RO membrane ~24 months), budget roughly £70–£80/year for all cartridges — noticeably cheaper to run than several rivals, and simple to maintain.
How it compares
| G5P700A | G3P600 | Frizzlife PD600 | |
|---|---|---|---|
| UK price | ~£299 | £399.99 | ~£405 |
| Remineralisation | Yes | No | Yes |
| Flow | 700 GPD | 600 GPD | 600 GPD |
| NSF certs | 58, 372 | 42, 58, 372 | 42, 53, 58 |
Verdict
The G5P700A earns 4.5/5 as the Waterdrop to buy if you want remineralised, fuller-tasting RO water and a bit more flow — often for less than the standard G3P600, which makes it a genuine value pick. Buy it if flat RO water bothers you and you prefer to stay with Waterdrop. Choose the G3P600 instead if you want the extra NSF/ANSI 42 certification and don’t need remineralisation, or the Frizzlife PD600 if you also want a live TDS display and lead certification.
Frequently asked questions
What's the difference between the Waterdrop G5P700A and G3P600?
The G5P700A adds alkaline remineralisation for a fuller taste and a faster 700 GPD flow, but lacks the G3P600's NSF/ANSI 42 chlorine certification. It's often cheaper too (from around £290). Choose the G5P700A for taste and value, the G3P600 for certification breadth.
Does the Waterdrop G5P700A remineralise water?
Yes. It has a built-in alkaline mineral stage that adds calcium and magnesium back after reverse osmosis, so the water tastes rounder and less 'flat' than pure RO water.
Is the G5P700A good for hard water?
Yes. It removes the dissolved minerals behind limescale, then remineralises for taste — a good balance for hard-water areas like London where pure RO can taste too soft.
How many filters does the G5P700A need?
Just two: a pre-filter roughly every six months and the RO membrane every two years. Budget roughly £70–£80 a year in total — cheaper than several rival systems.