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Versus · Compact Under-Sink Water Filters
A.O. SmithVSAquasana 5300
✓
For most buyers, the A.O. Smith wins. A.O. Smith edges ahead of Aquasana 5300 for most buyers, especially when reverse osmosis matters most. However, Aquasana 5300 is the stronger pick if you prioritize reverse osmosis.
or find your top pick across all compact under-sink water filters
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Updated Apr 14, 20262+ dimensionsNo sponsored rankingsPrices checked today
A.O. Smith
A.O. Smith
$100
See on Amazon →
A.O. Smith · $100
Winner
vs
Aquasana 5300
Aquasana 5300
$92
See on Amazon →
Aquasana 5300 · $92
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Compact Under-Sink Water Filters / Versus
What matters most to you?
Preferred certification for?
Top pick
A.O. Smith
$100Checked recently
Match score100%
Reverse OsmosisNSF/ANSI 421 Year or Less
$99.99 on Amazon →
vs
Aquasana 5300
$92Checked recently
Match score0%
Reverse OsmosisWQA Certified1 Year or Less
$91.99 on Amazon →
Head to head
A.O. SmithFeatureAquasana 5300
NSF/ANSI 42
Preferred certification for
WQA Certified
Carbon Block
Filtration system
Carbon Block
1-2 Years
Filter lifespan
1-2 Years
No
Need a dedicated faucet with
No
1-2 GPM
Preferred flow rate for the
1-2 GPM

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Key differences: A.O. Smith vs Aquasana 5300

Choosing between the A.O. Smith and the Aquasana 5300 comes down to what matters most to you in a compact under-sink water filters. Certifications like NSF/ANSI and WQA ensure that the water filter meets specific safety and performance standards. The A.O.

Smith leans toward nsf/ansi 42, while the Aquasana 5300 offers wqa certified. The A.O. Smith stands out for users who value reverse osmosis and nsf/ansi 42 and 1 year or less.

Meanwhile, the Aquasana 5300 is the stronger pick if reverse osmosis and wqa certified and 1 year or less are your top priorities. Rather than declaring an absolute winner, we recommend using the interactive comparison above — your priorities determine which product scores higher.

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