Cartridge faucets generally use an up/down motion to regulate water flow and control temperature with a left/right motion. If you have a two-handle faucet and the handles turn 90 degrees, you have either a cartridge or ceramic disk faucet.

Repairing a cartridge tub and shower faucet is a project many homeowners who are handy with a few basic tools can do themselves. Cartridge faucets typically develop leaks because the O-ring that cushions the faucet stem becomes worn or breaks. Repairing a leaky cartridge tub and shower faucet is usually a matter of removing the cartridge and replacing any worn or damaged O-rings.

As long as you’re removing the cartridge for repairs, you may find it easier to replace the cartridge itself. If you want to replace the cartridge, take the old cartridge you’re replacing to the store so you can match it to the exact cartridge you need. You may also want to pick up a repair kit, which has everything you need to replace all the parts in your faucet at one time, so your repair will last even longer. If you cannot remove the cartridge, and there is a visible mineral buildup, apply a calcium and lime remover to the affected area. Do not apply petroleum-based solvents, as these can damage parts of the faucet.

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