
Waterdrop UA-5Y
Score: 92/100
Aquasana SmartFlow RO
Score: 88/100Rankings

The Waterdrop UA-5Y is a compact under-sink filtration system featuring a 5-year filter lifespan and NSF/ANSI 372 certification for lead reduction. It offers easy, tool-free installation and effective removal of common contaminants like chlorine and microplastics. It is best suited for budget-conscious users seeking low-maintenance filtration in compact kitchen spaces.

The Aquasana SmartFlow® is a high-efficiency reverse osmosis system that excels at removing a wide spectrum of contaminants, including PFAS and fluoride, while retaining beneficial minerals through its remineralization stage. Its patented SmartFlow® technology significantly reduces water waste compared to standard RO units, making it an eco-friendly choice. It is best suited for health-conscious households prioritizing water purity and taste in areas with moderate water hardness.
| Attribute | ![]() | ![]() |
|---|---|---|
0.75 gallons per minutebest | 0.75 gallons per minutebest | |
60 monthsbest | 12 months | |
5best | 4 | |
5 yearsbest | 2 years | |
| ↓ lower better | 16.7 inches | 12.93 inchesbest |
| ↓ lower better | 3.6 inchesbest | 4.5 inches |
| ↓ lower better | 3.9 inchesbest | 15 inches |
0 percent | 96.4 percentbest |
Click an attribute name to sort · Green = best, red = worst (relative to this comparison)
| Attribute | ![]() | ![]() |
|---|---|---|
Value & Warranty(1) | ||
Warranty (years) | 5 years | 2 years |
Dimensions & Fit(3) | ||
Height (inches) | 16.7 inches | 12.93 inches |
Width (inches) | 3.6 inches | 4.5 inches |
Depth (inches) | 3.9 inches | 15.0 inches |
Performance & Filtration(6) | ||
Certifications | NSF/ANSI 372, IAPMO R&T Tested | WQA, NSF/ANSI 42, 53, 58, 401, CSA B483.1 |
Contaminants Removed | Chlorine, Lead, Mercury, PFOA/PFOS, Microplastics, VOCs (partial), Taste/Odor | Fluoride, PFAS, Arsenic, Lead, Chlorine, PFOA/PFOS, Microplastics, Nitrates, Nitrites, Mercury, VOCs, Chromium 6, TDS, Asbestos, Pharmaceuticals |
Filter Life (months) | 60 months | 12 months |
Filtration Stages | 5 | 4 |
Filtration Technology | Activated Carbon Block | Reverse Osmosis |
TDS Reduction (percent) | 0 percent | 96.4 percent |
Features & Accessories(1) | ||
Included Faucet | false | true |
Installation & Compatibility(2) | ||
Operating Pressure (psi) | 300 psi | 40-80 psi |
Installation Time (hours) | 0.05 hours | 2 hours |


Professional reviewers view the Waterdrop UA-5Y as a reliable, durable option specifically suited for households prioritizing long-term convenience and ease of installation over maximum contaminant removal breadth.
General user sentiment is positive, with primary praise focused on the super quick installation, high water flow, and consistently clear and clean tasting water.

“Super quick installation”

“High flow”

“Clear and clean tasting water”




Professional reviewers highlight the Aquasana SmartFlow® as a top-tier reverse osmosis system due to its exceptional contaminant removal capabilities and patented SmartFlow® technology. Experts emphasize that the system effectively mitigates common RO drawbacks like water waste and short filter life.
Users consistently praise the system for its high contaminant removal effectiveness, specifically noting the reduction of PFAS, lead, and fluoride. The compact design and easy, tool-free maintenance are frequently cited as major advantages for everyday use.