CuZn Under Sink Water Filter
Score: 88/100
iSpring RCC7AK
Score: 87/100Rankings
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 is a 6-stage reverse osmosis system with full-system NSF/ANSI 58 certification, designed to remove contaminants while restoring minerals for better taste. It requires adequate water pressure (45-70 psi) and may need a booster pump for low-pressure homes. It is best suited for health-conscious consumers prioritizing mineral content and neutral pH balance.
| Attribute | | |
|---|---|---|
2 gallons per minutebest | 0.052 gallons per minute | |
60 monthsbest | — | |
3 | 6best | |
50,000 gallonsbest | — | |
5 yearsbest | 1 years | |
| ↓ lower better | 15 inchesbest | 19 inches |
| ↓ lower better | 4.5 inchesbest | 5.1 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 | 5.1 inches |
Depth (inches) | 4.5 inches | 15.5 inches |
Performance & Filtration(8) | ||
Certifications | NSF/ANSI 42, 372, 61 | NSF/ANSI 58 |
Contaminants Removed | Lead, Mercury, Chlorine, PFAs | 99% |
Flow Rate (gallons per minute) | 2.0 gallons per minute | 0.052 gallons per minute |
Filter Life (months) | 60 months | null months |
Filtration Stages | 3 | 6 |
Filter Capacity (gallons) | 50000 gallons | null gallons |
Filtration Technology | Carbon/KDF | Reverse Osmosis |
TDS Reduction (percent) | 0 percent | 95 percent |
Features & Accessories(1) | ||
Included Faucet | false | true |
Installation & Compatibility(1) | ||
Installation Time (hours) | 0.5 hours | 1 hours |
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.”
“the best RO system out there”
Professional reviewers emphasize the iSpring RCC7AK's full-system NSF/ANSI 58 certification as a key market differentiator, noting that many competitors only certify individual components.
Everyday users consistently praise the ease of installation and the significantly improved water taste due to the remineralization stage.
