A.O. Smith Direct Connect Single-stage Carbon Block Under Sink Water Filtration System - Item # 12231963 | Model # AO-MF
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Fast, filtered water from your existing faucet
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Basic filtration - reduces up to 99% of 9 harmful contaminants including chlorine, lead, cysts, atrazine, lindane and turbidity
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Perfect for 1-4 people
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No water is wasted, and nothing is added to your water during the filtration process
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Includes system, one carbon block filter, and all parts necessary for installation; no plumber required
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Filter lasts 1,389 gallons or 6 months
What our Experts Think
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Reliable single-stage carbon filtration – Carbon block technology helps reduce up to 99% of common contaminants such as chlorine, lead, cysts, atrazine, and turbidity for cleaner-tasting drinking water.
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Fast, on-demand filtered water – Delivers filtered water directly from your existing faucet with a flow rate around 1.4 GPM, making it convenient for daily kitchen use.
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Simple under-sink installation – Direct-connect design includes all required parts and typically does not require a plumber, making setup quick and user-friendly.
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Long-lasting filter performance – Each filter provides up to 1,389 gallons or about 6 months of filtration, reducing maintenance frequency.
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No wasted water – Unlike some filtration systems, it filters water without producing wastewater or removing beneficial minerals.
Q&A
Q: What is the AO-MF water filtration system?
A: The AO-MF is a single-stage under-sink carbon block filtration system designed to provide clean, filtered drinking water directly from your existing faucet.
Q: What contaminants does it reduce?
A: It reduces up to 99% of 9 harmful contaminants, including chlorine, lead, cysts, atrazine, lindane, and turbidity.
Q: How long does the filter last?
A: The carbon block filter lasts up to 1,389 gallons or about 6 months, depending on water usage.
Q: Is installation difficult?
A: No. The system includes all installation parts and connects directly under your sink—no plumber required.
Q: Does the system waste water like reverse osmosis filters?
A: No. The AO-MF filtration process does not waste water or add chemicals to your drinking water.
Q: Who is it ideal for?
A: Perfect for households of 1–4 people who want a compact, reliable under-sink filtration solution.
Maintenance Tips
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Replace Filter Regularly: Change the carbon block filter every 6 months or 1,389 gallons for optimal filtration performance.
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Check Connections: Inspect tubing and fittings periodically to ensure there are no leaks under the sink.
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Flush After Replacement: Run water for a few minutes after installing a new filter to clear carbon particles.
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Keep Area Clean: Wipe the system housing and surrounding area to prevent dust or moisture buildup.
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Monitor Water Flow: Reduced flow may indicate the filter needs replacement or the line needs cleaning.
Damage 
Loss 
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