Full side-by-side
| Spec | Doulton Ceramic Filter | Prime Water | Winner |
|---|---|---|---|
| Origin | UK | Korea | — |
| Distribution | Retail · specialty water shops | Sole authorised distributor | — |
| Category | Ceramic under-sink filter (NOT a true ionizer) | Alkaline ionizer | — |
| Plates | 0 | 9 | Prime Water |
| pH (max alkaline) | 7.4 | 11.0 | Prime Water |
| ORP | -40 mV | -728 mV | Prime Water |
| Dissolved H₂ | 0.01 ppm | 1.34 ppm | Prime Water |
| Flow rate | 1.8 L/min | 4.0 L/min | Prime Water |
| Warranty | 1 yr | 5 yr | Prime Water |
| Filter cost (each) | S$ 95 | S$ 160 | Doulton Ceramic Filter |
| Sticker price | S$ 320 | S$ 2,800 / S$ 99/mo | Doulton Ceramic Filter |
| 5-year total | S$ 1,270 | S$ 5,940 | Doulton Ceramic Filter |
| Our rating | — | 4.7/5 | — |
Verdict
Cost over 5 years: Doulton Ceramic Filter saves S$ 4,670 over 5 years.
Lab performance: Doulton Ceramic Filter produces 0.01 ppm dissolved H₂; Prime Water produces 1.34 ppm. The Prime Water leads on hydrogen output.
Warranty: Doulton Ceramic Filter carries a 1-year warranty; Prime Water carries 5. Prime Water wins on coverage.
What we recommend: Prime Water (Sole-distributor Korean ionizer, 5-year warranty, no MLM markup). We disclose owning this brand — the numbers above support the verdict, you can replicate any of them with the published methodology.
Where to buy + showroom info
Doulton Ceramic Filter
Retail · specialty water shops
Lineup: HIP3 · HCS · HCP · countertop and under-sink ceramic systems
Visit Doulton →Prime Water
Sole authorised distributor
Showroom: Singapore · by appointment via primewater.com.sg
Lineup: L Series · R Series · LV Series · RV Series
Visit Prime Water →Read our full review →
No affiliate links · Waterionizer.sg earns zero from either purchase.