How to Fix a Leaky Faucet: Cartridge Filter Type
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Pull the cartridge straight up to remove it.
Use groove-joint pliers to grip the old cartridge and pull it straight up. Be careful not to break or damage either piece. If the pliers won't work, buy a tool called a stem puller that was made for your brand of faucet.
Clean the faucet and the faucet body to remove debris.