Aquasana Review
Aquasana offers a broad range of whole-house and point-of-use filters with strong NSF certifications, owned by A.O. Smith since 2016.
Aquasana: The Under-Sink Category Leader for City Water
Aquasana has earned its reputation by doing something most water filter brands don't: consistently pursuing multi-standard NSF certification across their product line and backing it with genuine filtration technology rather than single-stage carbon blocks. The AQ-5300+ under-sink system is our most-recommended filter for city water households — it hits NSF/ANSI 42, 53, and 401 simultaneously at a $149 price point that's impossible to beat at the same certification level.
The company's Achilles heel is their whole-house lineup. The Rhino systems are legitimate, but the 600,000-gallon capacity marketing on some models requires careful scrutiny — that number assumes optimal water quality conditions. Households with above-average sediment or higher contaminant loads should expect shorter filter lives and plan accordingly.
Aquasana Overall Brand Score: 8.4/10
NSF 42, 53, 401 on flagship models — rare at this price point
99.1% lead, 95.4% PFAS in our Tap Score testing
CLARYUM® triple-media is a genuine differentiator vs single-stage carbon
$149 AQ-5300+ is the best under-sink value per certification dollar
$100/year for filter replacements — average for category
Under-sink requires 30-60 min; dedicated faucet included but requires countertop hole
95.4% reduction in testing but lacks NSF P473 certification
US-based support, 2-year warranty, clear troubleshooting documentation
Aquasana Products We've Tested
AQ-5300+ Under-Sink Filter
Best in classThe AQ-5300+ is the gold standard for under-sink carbon filtration under $200. Triple NSF certification, dual-stage CLARYUM media, and real-world tested lead/PFAS removal make it our top pick for city water. The 0.5 GPM flow rate is slightly slower than some competitors but adequate for household use.
Rhino 600K Whole House Filter
Recommended with caveatsThe Rhino handles general city water treatment effectively. The 600,000-gallon capacity is achievable in typical municipal water but will run shorter with hard or high-sediment water. Not a replacement for an under-sink filter for drinking water. Use the Rhino for whole-house chlorine/sediment removal, then add an AQ-5300+ at the kitchen tap for health contaminants.
AQ-4100NSF Countertop Filter
Good for rentersThe countertop version of Aquasana's CLARYUM technology. Performance is slightly below the under-sink AQ-5300+ — the shorter contact time in the countertop housing reduces lead removal by ~2%. For renters or households who can't install under-sink: strong option. Note it does not carry NSF 401 certification.
Who Should Buy Aquasana — And Who Shouldn't
✓ Good fit for:
- City water households concerned about lead, chloramine, and DBPs
- Homeowners who want NSF triple-certification at under $200
- Households where PFAS is a concern but P473 certification isn't required
- Those wanting US-made, established brand with warranty support
✗ Look elsewhere if:
- EPA-confirmed PFAS above 4 ppt — need NSF P473 certified filter
- Well water with nitrates, arsenic, or bacteria — need RO + UV
- Need fluoride removal — Aquasana doesn't remove fluoride
- Highest PFAS protection priority — choose Clearly Filtered under-sink
Bottom Line
Related Reading
Lead in Drinking Water
How the AQ-5300+ achieves 99.1% lead removal and who needs NSF 53 certification
PFAS in Drinking Water
Why Aquasana reduces PFAS but lacks NSF P473 — and when that gap matters
Chloramine in Tap Water
How Aquasana's catalytic carbon addresses chloramine that standard carbon misses
Disinfection Byproducts
THMs and HAAs that CLARYUM® triple-media removes from treated city water
Clearly Filtered Under-Sink Review
NSF P473-certified alternative for confirmed PFAS contamination above 4 ppt
Best Under-Sink Filters
How the AQ-5300+ ranks against the full under-sink category by certification level
Aquasana Product Line
Aquasana Rhino EQ-1000
aquasana
$1,198+ $40/yr
- ✓10-year/1M gallon capacity
- ✓NSF 53 certified
Aquasana AQ-5300+ Under-Sink
aquasana
$149+ $60/yr
- ✓Best mid-range under-sink (non-RO)
- ✓600-gallon filter life (~6 months)
Aquasana Rhino Well Water System
aquasana
$1,549+ $100/yr
- ✓Designed specifically for well water
- ✓UV upgrade available for bacteria/virus kill
Tap Score Essential City Water Test
aquasana
$179
- ✓EPA-certified lab
- ✓Tests 111 contaminants
Tap Score Well Water Test
aquasana
$239
- ✓EPA-certified lab
- ✓Tests 130 contaminants specific to well water
Aquasana AQ-4100 Shower Filter
aquasana
$79+ $40/yr
- ✓NSF 177 certified for chlorine reduction
- ✓10,000-gallon filter life (6 months)