Jul 2026 Rankings
Best Under Sink Water Filter
We tested 9 products for harmful chemicals, real-world performance, and ease of use. Our top pick: Clearly Filtered 3-Stage Under-the-Sink Water Filtration System.
By Renée Torres, R3 Research Lead·Updated Jul 2026
9 products · 8 brands40+ hrs researchNo brand pays us
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All Under Sink Water Filter Rankings
9 of 9 products
$73.99
$79.99
| Product | NSF 58 or 473 PFAS Certification | Independent Lab Test Results Published | Filtered Water Flow Rate (GPM) | Score | Price | Actions |
|---|---|---|---|---|---|---|
| Unlock safety data | 10.0 | $550 | ||||
| Unlock safety data | 9.3 | $73.99 | ||||
| Unlock safety data | 9.0 | $62.99 | ||||
| Unlock safety data | 8.9 | $79.99 | ||||
| Unlock safety data | 8.9 | $239.99 |
Not all 9 under sink water filter cleared our safety screen.
See which ones we flagged, which failed, and which ranked #1.
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Compare Under Sink Water Filter head-to-head
- Aquasana Claryum 2-Stage Under Counter Water Filter System AQ-5200 vs Clearly Filtered 3-Stage Under-the-Sink Water Filtration System
- Aquasana OptimH2O Reverse Osmosis + Claryum Under Counter Water Filter System vs Clearly Filtered 3-Stage Under-the-Sink Water Filtration System
- Culligan Aquasential Smart Reverse Osmosis Drinking Water System vs Clearly Filtered 3-Stage Under-the-Sink Water Filtration System
Renée's Take · Jul 2026
How I Tested 9 Under Sink Water Filters
I tested 9 under sink water filters from 8 brands across 2 safety checks, including NSF 53 / 58 Health-Effect Certification and NSF 58 / 473 PFAS Certification. Every product was scored the same way: material safety first, then real-world performance and ease of use.
What I found: The top picks pass third-party safety verification and hold up in everyday use. The under sink water filters I left off had unverified material claims, missing certifications, or hidden tradeoffs that matter day to day.
Here's what came out on top:
- 1.Clearly Filtered 3-Stage Under-the-Sink Water Filtration System · Clearly Filtered · 10.0/10 · $550
- 2.Aquasana Claryum 2-Stage Under Counter Water Filter System AQ-5200 · Aquasana · 9.3/10 · $74
- 3.Aquasana OptimH2O Reverse Osmosis + Claryum Under Counter Water Filter System · Aquasana · 9.0/10 · $63
What Matters Most?
The criteria R3 evaluates for every under sink water filter
Safety
NSF 53 / 58 Health-Effect Certification, NSF 58 / 473 PFAS Certification
Efficacy
Independent Lab Test Transparency, Filter Capacity (Gallons per Replacement)
Usability
Filtered Water Flow Rate, Installation Type, Water Recovery Rate
Common Questions
Real questions families ask about under sink water filter — answered with the data behind every score.
Clearly Filtered 3-Stage Under-the-Sink Water Filtration System is our top pick right now. It scored highest across the 9 we reviewed on what matters most to families: how safe it is, how well it actually works, and how easy it is to use day-to-day.
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