Top 5 under-sink water filters reviewed and ranked.
Aquasana Claryum AQ-5300+ is our top pick for under-sink water filters — an averaged 4.7/5 across 1 published review at about $260. Runner-up: iSpring RCC7AK (~$240).
| # | Product | Rating | Price | Best for | |
|---|---|---|---|---|---|
| 1 | Aquasana Claryum AQ-5300+Top Score | 4.7 (1 source) | $260 | users wanting heavy-metal removal without RO water waste | $260 · Check Price on Amazon |
| 2 | 4.7 (1 source) | $240 | households on city water with fluoride / arsenic concerns | $240 · Check Price on Amazon | |
| 3 | 4.7 (1 source) | $280 | buyers prioritizing USA manufacturing in RO | $280 · Check Price on Amazon | |
| 4 | 4.6 (1 source) | $399 | users with limited under-sink space who still want RO | $399 · Check Price on Amazon | |
| 5 | 4.5 (1 source) | $100 | renters and first-time under-sink filter buyers | $100 · Check Price on Amazon |
The Claryum is the best-overall non-RO pick — Aquasana's flagship removes 77 contaminants without RO water waste.
The RCC7AK is the best-overall RO pick — iSpring's 6-stage with alkaline remineralization removes more contaminants than non-RO competitors.
The ROES-PH75 is the USA-made RO pick — APEC's flagship 6-stage with alkaline pH boost.
The SmartFlow is the tankless RO pick — Aquasana's compact RO with smart leak detection saves space.
The MP99 is the budget pick — Frizzlife's easy-swap filter at under $100. Best for renters and first-time buyers.
| Spec | Aquasana Claryum AQ-5300+ | iSpring RCC7AK | APEC ROES-PH75 | Aquasana SmartFlow Reverse Osmosis | Frizzlife MP99 |
|---|---|---|---|---|---|
| Type | Non-RO multi-stage | 6-stage RO | 6-stage RO | Tankless RO | Non-RO |
| Cartridge | 6-month | — | — | — | Twist-and-pull |
| Cert | — | NSF | — | NSF 58 | NSF 42/53 |
| Removal | — | — | — | 96% contaminants | 99% lead/chlorine |