
iSpring RO800G
Score: 75/100
iSpring RO5004F
Score: 85/100Rankings

The iSpring RO5004F is a high-performance, tankless under-sink reverse osmosis system featuring a 6-layer filtration design with built-in UV protection. It delivers a high flow rate of 500 GPD with a built-in pump to handle low water pressure, filling a cup in just 10 seconds. The system is designed for space-constrained kitchens and includes smart filter monitoring for easy maintenance.

The iSpring RO800G is a tankless reverse osmosis under-sink water filtration system designed to deliver up to 800 gallons per day with a flow rate of 0.6 gallons per minute. It features a space-saving design that eliminates the need for a storage tank and offers a high water efficiency ratio of 2.5:1 pure to drain. The system is ideal for high-demand users needing rapid RO water such as large families, offices, or restaurants.
| Attribute | ![]() | ![]() |
|---|---|---|
2 stages | 6 stagesbest | |
800 gallons per daybest | 500 gallons per day | |
— | 99 percentbest | |
0 gallonsbest | 0 gallonsbest | |
10 count | 1,000 countbest | |
| ↓ lower better | 6.5 inches | 6.1 inchesbest |
| ↓ lower better | 17.75 inches | 16.6 inchesbest |
Click an attribute name to sort · Green = best, red = worst (relative to this comparison)
| Attribute | ![]() | ![]() |
|---|---|---|
Compliance & Safety(1) | ||
Certifications | SGS Tested | |
Design(2) | ||
System Width (inches) | 6.50 inches | 6.1 inches |
System Height (inches) | 17.75 inches | 16.6 inches |
Performance(6) | ||
Filtration Stages (stages) | 2 stages | 6 stages |
Daily Production Rate (gallons per day) | 800 gallons per day | 500 gallons per day |
TDS Reduction Rate (percent) | percent | 99 percent |
Wastewater Ratio | 2.5:1 | 2:1 |
Contaminants Removed (count) | 10+ count | 1000 count |
Feed Water Pressure (PSI) | PSI | 30-70 PSI |
Features(1) | ||
Faucet Type | Dedicated Faucet | |


Products in the top-left offer the best value (high score, low price).

Search results lack in-depth expert reviews from major testing sites like Wirecutter or Consumer Reports. However, retailer descriptions and YouTube installation guides highlight the system as a top-of-the-line solution, emphasizing its fast flow, high efficiency, and next-generation features.
Limited consumer feedback is available, with one Wayfair review rating the product 3 out of 5 stars, indicating middling satisfaction without specific details.

Professional sources describe the iSpring RO5004F as a high-performance, ultimate-class residential filtration system. Reviewers highlight its ability to deliver pure, safe, and fast water, making it suitable for families and daily use.
Detailed consumer feedback, ratings, and specific user complaints are not available in the provided search results.
