CuZn Under Sink Water Filter
Score: 88/100
iSpring RCC7AK Black
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 iSpring RCC7AK-BLK is a 6-stage under-sink reverse osmosis system certified by NSF/ANSI 58 to remove up to 99% of over 1,000 contaminants. It features an alkaline remineralization stage that restores minerals and pH balance, producing bottled-water quality taste without requiring electricity. It is best suited for homeowners with adequate water pressure (40-80 PSI) who want a pumpless, energy-efficient solution.
| Attribute | | |
|---|---|---|
2 gallons per minutebest | — | |
60 monthsbest | — | |
3 | 6best | |
50,000 gallonsbest | — | |
5 yearsbest | 1 years | |
| ↓ lower better | 15 inchesbest | 19 inches |
| ↓ lower better | 4.5 inchesbest | 16 inches |
| ↓ lower better | 4.5 inchesbest | 15.5 inches |
Click an attribute name to sort · Green = best, red = worst (relative to this comparison)
| Attribute | | |
|---|---|---|
Value & Warranty(1) | ||
Warranty (years) | 5 years | 1 years |
Dimensions & Fit(3) | ||
Height (inches) | 15.0 inches | 19.0 inches |
Width (inches) | 4.5 inches | 16.0 inches |
Depth (inches) | 4.5 inches | 15.5 inches |
Performance & Filtration(5) | ||
Certifications | NSF/ANSI 42, 372, 61 | NSF/ANSI 58 |
Contaminants Removed | Lead, Mercury, Chlorine, PFAs | Sediment, vinyl chloride, chlorine, fluoride, lead, arsenic, PFAS, asbestos, calcium, sodium |
Filtration Stages | 3 | 6 |
Filtration Technology | Carbon/KDF | Reverse Osmosis |
TDS Reduction (percent) | 0 percent | 97.9 percent |
Features & Accessories(1) | ||
Included Faucet | false | true |
Installation & Compatibility(1) | ||
Installation Type | Under Sink | Under-sink |
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.”
