Water filters, scored
Ranked by composite. Certification credit requires a listing on the official NSF/WQA/IAPMO database. "Tested to" is not "certified to."
| Score | Unit | $/gal |
|---|---|---|
| 7.5 | Culligan US-EZ-4 Under-Sink | $0.091 |
| 7.3 | Brita Elite Pitcher (10-Cup) | $0.167 |
| 7.2 | Aquasana AQ-5200 Under-Sink | $0.148 |
| 7.2 | AquaTru Classic Countertop RO | $0.287 |
| 6.8 | Frizzlife SK99 Under-Sink Filter | $0.031 |
| 6.1 | iSpring RCC7 5-Stage RO | $0.024 |
| 6.0 | Brita Faucet Mount (Elite) | $0.180 |
| 6.0 | Express Water RO5DX 5-Stage RO | $0.021 |
| 5.7 | Waterdrop 10UA Under-Sink | $0.005 |
| 5.6 | Brita Standard Pitcher | $0.200 |
| 5.4 | PUR Plus Faucet Mount (PFM400H) | $0.250 |
| 4.9 | ZeroWater 5-Stage Pitcher (7-Cup) | $1.167 |
| 4.9 | PUR Plus Pitcher (7-Cup) | $0.374 |
| 4.9 | Waterdrop G3P800 Tankless RO | $0.123 |
| 4.3 | Home Master TMAFC-ERP Artesian RO | $0.038 |
| 4.1 | Epic Smart Shield Under-Sink | $0.177 |
| 4.0 | APEC ROES-50 Essence RO | $0.145 |
| 3.8 | Aquasana Rhino EQ-1000 Whole House | $0.001 |
| 3.7 | SpringWell CF1 Whole House | $0.000 |
| 3.2 | Big Berkey Gravity System | $0.028 |
| 3.2 | Epic Pure Pitcher | $0.353 |
| 2.7 | LifeStraw Home Pitcher | $0.288 |
| 2.5 | Clearly Filtered Pitcher | $0.495 |
| 1.7 | Clearly Filtered 3-Stage Under-Sink | $0.198 |
| 1.5 | Great Value Water Filter Pitcher (HS528N) | n/a |