Brondell H2O+ Circle vs PUR PLUS FM-3700B — Which Should You Buy?
Side-by-side comparison of Brondell H2O+ Circle and PUR PLUS FM-3700B. We compare specs, performance, and value to help you decide.
Feature Comparison
| Feature | Brondell H2O+ Circle | PUR PLUS FM-3700B |
|---|---|---|
| Type | 3-stage carbon | 2-stage carbon |
| Filter Life | 2 years | 3 months |
| Capacity | 1,320 gallons | 100 gallons |
| Removes | Chlorine, lead, cysts | Lead, chlorine |
| Design | Compact circle | — |
| Installation | Under sink | Under sink |
| Flow Rate | 0.5 GPM | — |
| Warranty | 1 year | 90 days |
| Certification | — | NSF |
| Faucet | — | Included |
Brondell H2O+ Circle
Pros
- ✓2-year filter life
- ✓1,320 gallon capacity
- ✓Compact
- ✓3-stage
- ✓Removes lead, cysts
- ✓Easy filter change
- ✓Sleek design
Cons
- ✗Not RO
- ✗Lower flow
- ✗Premium price for non-RO
PUR PLUS FM-3700B
Pros
- ✓Budget-friendly
- ✓NSF certified
- ✓Reduces lead, chlorine
- ✓2-stage
- ✓Simple install
- ✓Dedicated faucet
- ✓Trusted brand
Cons
- ✗Basic filtration
- ✗Doesn't remove fluoride
- ✗Filter life 3 months
Our Verdict
Brondell H2O+ Circle
The best under-sink filter for long filter life—2 years between replacements.
Price Drop Alert — View Deal NowPUR PLUS FM-3700B
The best budget under-sink filter—basic NSF-certified filtration at the lowest price.
Limited Offer — Check Today's PriceOur Methodology
We test each under-sink filter for contaminant reduction, installation ease, and long-term cost. No manufacturer has editorial influence.
Related Comparisons
Best Under-Sink Water Filters 2026
Our ranked list of the best under sink water filters for 2026. Tested and reviewed independently.
OverviewCompare Under-Sink Water Filters
Compare under sink water filters side by side. Filter by specs, price, and features.
CompareCompare PureTap Products — Pick Two to Compare
Choose any two products to see a detailed side-by-side comparison. Compare specs, features, and value.
Head to HeadWaterdrop G3P800 Tankless RO vs Brondell H2O+ Circle — Which Should You Buy?
Side-by-side comparison of Waterdrop G3P800 Tankless RO and Brondell H2O+ Circle. We compare specs, performance, and value to help you decide.
Head to HeadWaterdrop G3P800 Tankless RO vs PUR PLUS FM-3700B — Which Should You Buy?
Side-by-side comparison of Waterdrop G3P800 Tankless RO and PUR PLUS FM-3700B. We compare specs, performance, and value to help you decide.
Head to HeadAquasana AQ-5200 vs Brondell H2O+ Circle — Which Should You Buy?
Side-by-side comparison of Aquasana AQ-5200 and Brondell H2O+ Circle. We compare specs, performance, and value to help you decide.
Head to HeadAquasana AQ-5200 vs PUR PLUS FM-3700B — Which Should You Buy?
Side-by-side comparison of Aquasana AQ-5200 and PUR PLUS FM-3700B. We compare specs, performance, and value to help you decide.