Things You Will Need
When the handle of the faucet starts dripping water, the cartridge is likely the culprit.
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Turn the handle on the water supply line underneath the sink to shut off the water to the faucet. Open the faucet to drain any water from the lines.
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Remove the cap on the top of the faucet handle using a flat-tip screwdriver. Remove the screw holding the handle on the unit with a Phillips screwdriver. Remove the handle from the unit.
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Remove the brass nut from around the handle using a wrench. Turn the brass nut counterclockwise to remove it.
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Grab the top of the cartridge with a wrench and wiggle it back and forth.
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Insert the new cartridge into the faucet and reassemble.