Express Water Alkaline RO
Score: 82/100
Purewell PW-OB-PH
Score: 72/100Rankings
The Express Water 10-Stage Reverse Osmosis Alkaline Water Filtration System is an under-sink unit that combines reverse osmosis technology with alkaline mineralization to remove up to 99.99% of contaminants while adding beneficial minerals back into the water. It includes a 4-gallon storage tank, dedicated faucet, and all necessary installation components for a complete DIY setup. Best suited for families of 4+ people seeking a permanent under-sink filtration solution.
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 | 6 monthsbest | |
10 stagesbest | 6 stages | |
99.99 %best | — | |
| ↓ lower better | 40 PSIbest | — |
| ↓ lower better | — | 0.01 micronsbest |
1 yearsbest | — | |
| ↓ lower better | 17 inchesbest | 20 inches |
Click an attribute name to sort · Green = best, red = worst (relative to this comparison)
| Attribute | | |
|---|---|---|
Health & Safety(1) | ||
Certifications | NSF 58 | 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) | microns | 0.01 microns |
Dimensions & Build(3) | ||
Height (inches) | 17 inches | 20.0 inches |
Width (inches) | 15 inches | 8.8 inches |
Depth (inches) | 5 inches | 8.8 inches |
Products in the top-left offer the best value (high score, low price).
Professional assessment highlights the Express Water system as a certified, comprehensive solution for residential drinking water. The NSF 58 certification is emphasized as a key indicator of quality and reliability.
The product is marketed as a practical solution for families and well water users, with the 4-gallon tank specifically noted as addressing the slow flow rate by allowing water accumulation.
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.
