Water Filtration

AO Smith AO-US-200 Under Sink Water Filter

Name: AO Smith AO-US-200 Under Sink Water Filter
Brand: AO Smith

AO Smith

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AO Smith AO-US-200 Under Sink Water Filter

Our Take

A.O. Smith's under-sink filter is the value-tier alternative to RO, single-stage carbon block + GAC. Removes chlorine, lead, asbestos, mercury, but NOT fluoride (you need RO for fluoride). Easier install than RO, no water waste, ~$50/year filter replacement. The right pick if your water concerns are urban-supply contaminants but not fluoride.

Pros

Easier install than RO, no electricity, no drain line
No wasted water (vs RO's 3:1 waste ratio)
Removes lead, mercury, asbestos, chlorine

Cons

Doesn't remove fluoride (RO is required for that)
Lower contaminant scope than full RO systems

Evidence and regulatory context

Potential benefits depend on the studied population, protocol and exact product. A result for one device or ingredient does not establish the same effect for every consumer product. Our comparisons do not establish a diagnosis or an individual treatment plan.

FDA establishment registration, device listing and a device class do not establish approval or clearance of this exact model or every advertised benefit. When clearance is relevant, check the model and the specific intended use. FDA explanation.