Waterdrop X8 Review 2026
The Waterdrop X8 is one of the best under-sink systems for households that want both RO filtration and UV bacteria protection in one unit. NSF 58, 42, and 372 certified, 800 GPD, with a UV stage that targets bacteria and viruses - a combination few other under-sink filters on this list offer. It's the most expensive option here, but it's genuinely one of the only under-sink RO + UV systems at this certification level. For families on well water or anyone wanting maximum protection at the kitchen tap, the X8 closes the gap that RO alone leaves open.
- UV sterilization - targets bacteria & viruses
- 800 GPD - fast on-demand flow
- Smart LED faucet with TDS display
- Highest price on this list
- Requires electricity under sink
- No remineralization
- UV bulb needs periodic replacement
UV sterilization - what it does that RO doesn't
Standard RO membranes (0.0001 micron) block most bacteria and viruses through physical size exclusion - most are too large to pass. However, the membrane is not guaranteed to be 100% effective against all viruses, and a compromised membrane may allow passage. UV sterilization adds a second layer - it inactivates bacteria, viruses, and cysts by disrupting their DNA, rendering them unable to reproduce. No chemicals, no byproducts. The X8's UV stage runs after the RO membrane, catching anything that might have passed through. For well water users or households with any concern about biological contamination, this dual protection is among the most comprehensive available at the under-sink level.
NSF certification - what's verified
The X8 is certified by IAPMO R&T against NSF 58 (RO contaminant reduction), NSF 42 (chlorine taste and odor), and NSF 372 (lead-free materials). SGS third-party testing supports reduction of PFOA, PFOS, chlorine, fluoride, lead, barium, chromium-VI, microplastics, and more. The 9-stage filtration includes a 0.0001μm RO membrane with 16 layers for durability.
X8 vs G3P600 - which Waterdrop to choose
| Feature | Waterdrop X8 | Waterdrop G3P600 |
|---|---|---|
| Price tier | Premium | Mid |
| UV sterilization | Yes | No |
| Capacity | 800 GPD | 600 GPD |
| Filtration stages | 9-stage | 8-stage |
| NSF certs | 58, 42, 372 | 58, 42, 372 |
| Drain ratio | 2:1 | 2:1 |
| Cup fill time | 5 seconds | 8 seconds |
| Best for | Well water, max protection | Municipal water, space saving |
Choose X8 if: you're on well water, you want UV protection at the tap, or you want the highest-spec under-sink system available. The UV stage is the key differentiator.
Choose G3P600 if: you're on municipal water with no biological contamination concerns. Same core NSF certifications at a lower price, and the performance difference for chlorinated city water is minimal.
Alternatives worth considering
FAQ
Does the Waterdrop X8 remove bacteria?
Is the Waterdrop X8 worth the price vs G3P600?
Does the X8 require electricity?
How long do X8 filters last?
Buying direct from the brand
Some of the makers on this page also sell the same systems on their own sites and run their own affiliate programs. We earn a commission from those links too, at no extra cost to you. Prices, bundles and warranty terms can differ from Amazon, so compare both before you buy.
- Waterdrop X Series X8 on Waterdrop's own site ↗ (paid link)