Express Water Alkaline UV
Score: 88/100
Purewell PW-OB-PH
Score: 72/100Rankings
The Express Water 100 GPD system is a multi-stage under-sink water filtration unit that integrates reverse osmosis, UV sterilization, and alkaline mineralization to remove up to 99.99% of contaminants. It offers comprehensive purification for large households, though the slow flow rate and space requirements are notable trade-offs. It is best suited for large households (8+ people) seeking comprehensive water purification.
The Purewell 6-Stage system offers high-precision 0.01-micron filtration in a durable stainless steel body, making it excellent for removing microscopic contaminants. However, it lacks TDS reduction capabilities and has a limited water capacity. It is best suited for small households or off-grid use where fine filtration is prioritized over mineral adjustment.
| Attribute | | |
|---|---|---|
0.035 GPM | 4 GPMbest | |
— | 6 monthsbest | |
10 stagesbest | 6 stages | |
99.99 %best | — | |
| ↓ lower better | 40 PSIbest | — |
| ↓ lower better | — | 0.01 micronsbest |
1 yearsbest | — | |
| ↓ lower better | 19 inchesbest | 20 inches |
Click an attribute name to sort · Green = best, red = worst (relative to this comparison)
| Attribute | | |
|---|---|---|
Health & Safety(1) | ||
Certifications | NSF | NSF/ANSI 42, 372 |
Installation & Compatibility(1) | ||
Installation Type | Under-sink | Countertop / Gravity |
Filtration & Performance(4) | ||
Filtration Technology | Reverse Osmosis | Ultra-Filtration (UF) and Carbon |
Flow Rate (GPM) | 0.035 GPM | 4.0 GPM |
Filtration Stages (stages) | 10 stages | 6 stages |
Micron Rating (microns) | null microns | 0.01 microns |
Maintenance & Warranty(1) | ||
Filter Lifespan (months) | null months | 6 months |
Dimensions & Build(3) | ||
Height (inches) | 19.0 inches | 20.0 inches |
Width (inches) | 14.0 inches | 8.8 inches |
Depth (inches) | 5.0 inches | 8.8 inches |
Products in the top-left offer the best value (high score, low price).
Professional reviews are limited, but the product carries NSF certification for its reverse osmosis components, validating its contaminant reduction claims. The system is distinguished by its triple-technology approach, integrating UV sterilization and alkaline mineralization with standard RO filtration, placing it in the premium category for comprehensive purification.
Users generally rate the system highly, praising its ability to produce clean, great-tasting water and its comprehensive filtration capabilities. The automatic leak detection and easy installation are frequently highlighted positives.
Professional reviews highlight the Purewell system as a well-crafted solution for fine filtration needs, praising its 0.01-micron accuracy and durable construction, while noting the inability to reduce TDS.
Users appreciate the ease of use, portability, and effective contaminant removal, though some note the slower flow rate and limited capacity as minor inconveniences.
