The Frizzlife PD600 is a direct rival to the Waterdrop systems, but it has two tricks they don’t: it adds minerals back to the water after filtering (so it doesn’t taste “flat”), and it shows you a live TDS reading so you can see it working. For some UK buyers, those features are exactly what tips the decision. Here’s our research-based assessment of the flagship PD600-TAM3.
Who is this for?
The PD600-TAM3 suits a homeowner who wants reverse osmosis but worries RO water tastes too soft or “empty.” The built-in alkaline remineralisation puts beneficial minerals back, giving a rounder taste closer to good bottled water. It’s also for the data-curious: the LED display showing real-time TDS is genuinely satisfying and reassuring.
If you don’t care about remineralisation, the plain PD600 (~£329) does the same filtration for less — and undercuts most rivals. This review covers the alkaline TAM3 version specifically.
Key specs
| Frizzlife PD600-TAM3 | |
|---|---|
| Flow rate | 600 GPD |
| Filtration | 3-stage tankless RO + alkaline |
| Efficiency | 2:1 pure-to-drain |
| RO membrane life | 24 months |
| Dimensions | ~37 × 13.5 × 39 cm (very slim) |
| Warranty (UK) | 1 year (150% with registration) |
| UK price | ~£405 (from £449.99); plain PD600 ~£329 |
What it removes
The PD600 is well-certified — and on paper it actually covers one important standard the Waterdrop G3P600 doesn’t:
- TDS / dissolved solids — NSF/ANSI 58 certified
- Lead & heavy metals — NSF/ANSI 53 certified (a genuine plus for older UK homes)
- Chlorine, taste & odour — NSF/ANSI 42
- PFAS — reduced as part of RO filtration
- Limescale-forming minerals — then partially remineralised for taste
That NSF/ANSI 53 lead certification is a meaningful advantage if you live in older housing with legacy lead pipework.
UK hard-water performance
In hard-water London and the South East (~280 mg/L), the PD600 does what any good RO system does — strips the dissolved minerals behind limescale — but then the TAM3 alkaline stage adds a measured amount back, which many owners prefer for taste. The live TDS display is genuinely useful here: you can watch your incoming hard-water TDS drop dramatically through the system. As with all RO in hard water, expect the sediment/carbon pre-filter to need changing toward the shorter end of its 12-month life.
Installation
At just 13.5 cm deep the PD600 is one of the slimmest under-sink units around — a real advantage in shallow UK cabinets. Like its rivals it plumbs into the cold feed, drains into the waste, and needs a 13A socket under the sink. It’s a competent-DIY job; budget for an electrician if you don’t have a socket there.
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Based on Frizzlife UK’s filter prices (sediment/carbon £33.99/year, RO membrane £85.99 every two years, inner filter £29.99/year), the amortised cost works out at roughly £110/year — actually a touch cheaper than the Waterdrop G3P600, because the RO membrane lasts two years. A little more in hard-water areas where the pre-filter needs changing sooner.
How it compares
| Frizzlife PD600-TAM3 | Waterdrop G3P600 | |
|---|---|---|
| UK price | ~£405 | £399.99 |
| Remineralisation | Yes (alkaline) | No |
| Live TDS display | Yes | No |
| NSF certs | 42, 53, 58 | 42, 58, 372 |
| Annual filters | ~£110 | ~£148 |
| Cabinet depth | 13.5 cm | 14.4 cm |
See the full head-to-head in our Waterdrop vs Frizzlife comparison.
Verdict
The Frizzlife PD600 earns 4.5/5. It matches the under-sink Waterdrops on the essentials and adds two things they lack: alkaline remineralisation for better-tasting water and a live TDS display that’s genuinely reassuring — plus NSF/ANSI 53 lead certification. Buy the TAM3 if flat-tasting RO water puts you off, or you want lead certification and live data. Buy the plain PD600 (~£329) if you want the cheapest tankless RO and don’t care about remineralisation. Choose the Waterdrop G3P600 instead if you want slightly lower running costs and the simplest possible system.
Frequently asked questions
Is the Frizzlife PD600 better than the Waterdrop G3P600?
They're close. The Frizzlife PD600-TAM3 adds alkaline remineralisation, a live TDS display and NSF/ANSI 53 lead certification; the Waterdrop G3P600 is slightly cheaper to run and very slightly cheaper upfront. Choose the Frizzlife if taste and lead certification matter most.
What does alkaline remineralisation do?
Reverse osmosis removes beneficial minerals along with contaminants, which can make water taste 'flat'. The PD600-TAM3's alkaline stage adds a measured amount of minerals back, giving a rounder taste closer to good bottled water.
Does the Frizzlife PD600 remove lead and PFAS?
Yes. It's certified to NSF/ANSI 53 for lead and heavy metals — useful in older UK homes — and reduces PFAS as part of its reverse-osmosis filtration, alongside TDS and chlorine.
How much does the Frizzlife PD600 cost to run?
About £110 a year in replacement filters once amortised (the RO membrane lasts two years) — a touch cheaper than the Waterdrop G3P600. The sediment/carbon pre-filter needs changing more often in hard-water areas, which nudges the cost up.
What's the difference between the PD600 and PD600-TAM3?
The TAM3 adds an alkaline remineralisation stage for better taste and costs more (~£405 vs ~£329 for the plain PD600). Both share the same 600 GPD reverse-osmosis filtration and certifications.