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Versus · Compact Under-Sink Water Filters
A.O. SmithVSCulligan DC3
✓
A.O. Smith and Culligan DC3 are remarkably close overall. In this category, the right choice depends on your specific priorities.
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
vs
Culligan DC3
Culligan DC3
$70
See on Amazon →
Culligan DC3 · $70
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Compact Under-Sink Water Filters / Versus
What matters most to you?
Filtration system?
A.O. Smith
$100Checked recently
Match score100%
Carbon BlockNSF/ANSI 421 Year or Less
$99.99 on Amazon →
vs
Culligan DC3
$70Checked recently
Match score100%
Direct ConnectNSF/ANSI 421 Year or Less
$69.95 on Amazon →
Head to head
A.O. SmithFeatureCulligan DC3
Carbon Block
Filtration system
Direct Connect
NSF/ANSI 42
Preferred certification for
NSF/ANSI 42
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 Culligan DC3

Choosing between the A.O. Smith and the Culligan DC3 comes down to what matters most to you in a compact under-sink water filters. The type of filtration system determines the range of contaminants it can remove. The A.O. Smith leans toward carbon block, while the Culligan DC3 offers direct connect.

The A.O. Smith stands out for users who value carbon block and nsf/ansi 42 and 1 year or less. Meanwhile, the Culligan DC3 is the stronger pick if direct connect and nsf/ansi 42 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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