A high-quality Delta shower cartridge typically lasts between ten and fifteen years under normal residential operating conditions before rubber O-ring fatigue, internal seal wear, or hard water mineral scaling causes handle stiffness or a dripping leak. In households supplied with hard water containing high concentrations of calcium and magnesium, mineral deposits accumulate much faster inside the valve body, shortening the cartridge's functional lifespan. Swapping an aging cartridge quickly restores performance.
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