CuZn Under Sink Water Filter
Score: 88/100
Express Water RO5DX
Score: 85/100Rankings
The CuZn UC-200 is a high-performance under-sink filter featuring a 5-year lifespan and KDF-55 technology for effective contaminant removal without sacrificing flow rate. Its primary limitation is its large physical size, which may not fit in all under-sink cabinets, and its inability to reduce TDS. It is best suited for households with municipal water seeking low-maintenance, high-flow filtration.
The Express Water RO5DX is a 5-stage reverse osmosis system that provides high-quality purified water with NSF/ANSI 58 certification and alkaline remineralization. Its main trade-off is the production of wastewater and the need for regular filter maintenance. It is best suited for households of 4+ people seeking reliable daily drinking water with improved taste.
| Attribute | | |
|---|---|---|
2 gallons per minutebest | 0.8 gallons per minute | |
60 monthsbest | 12 months | |
3 | 6best | |
50,000 gallonsbest | 50 gallons | |
5 yearsbest | 1 years | |
| ↓ lower better | 15 inchesbest | 15 inchesbest |
| ↓ lower better | 4.5 inchesbest | 5 inches |
| ↓ lower better | 4.5 inchesbest | 14 inches |
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| Attribute | | |
|---|---|---|
Value & Warranty(1) | ||
Warranty (years) | 5 years | 1 years |
Dimensions & Fit(2) | ||
Width (inches) | 4.5 inches | 5.0 inches |
Depth (inches) | 4.5 inches | 14.0 inches |
Performance & Filtration(8) | ||
Certifications | NSF/ANSI 42, 372, 61 | NSF/ANSI 58 |
Contaminants Removed | Lead, Mercury, Chlorine, PFAs | Lead, Chlorine, Fluoride, Arsenic, PFAS, Bacteria |
Flow Rate (gallons per minute) | 2.0 gallons per minute | 0.8 gallons per minute |
Filter Life (months) | 60 months | 12 months |
Filtration Stages | 3 | 6 |
Filter Capacity (gallons) | 50000 gallons | 50 gallons |
Filtration Technology | Carbon/KDF | Reverse Osmosis |
TDS Reduction (percent) | 0 percent | 93-99 percent |
Features & Accessories(1) | ||
Included Faucet | false | true |
Products in the top-left offer the best value (high score, low price).
Professional reviewers and editors praise the CuZn UC-200 for its industry-leading flow rate and exceptional longevity, positioning it as a superior alternative to standard under-sink filters.
Everyday users consistently report significant improvements in water taste and clarity, with many noting that the high flow rate remains unaffected even after years of use.
“Effortless install (under 30 minutes DIY) and longevity beyond 3-5 years in low-use homes.”
“Noticeable improvement in taste, clarity, and odor removal, with many reporting no flow reduction after years of use.”
Professional reviewers highlight the RO5DX's NSF/ANSI 58 certification as a key strength, validating its TDS reduction capabilities and material safety. While experts note that the certification does not cover the full range of 158 claimed contaminants, they consider TDS reduction the most important metric for RO systems. Hands-on testing confirmed a 93% TDS reduction rate, though some TDS creep was observed during idle periods. The pre-assembled kit is praised for simplifying installation.
Users generally praise the system for its reliable performance, compact size, and the peace of mind provided by NSF certification. The all-in-one kit format is appreciated for its convenience, and users report a noticeable improvement in water taste. Maintenance is described as simple and manageable for non-technical users.
