A Moen 1222 Posi-Temp shower cartridge typically lasts between ten and fifteen years under normal residential operating conditions before mineral scale deposits, rubber O-ring degradation, or internal stem wear causes stiffness or dripping leaks. In households supplied with hard water containing high concentrations of calcium and magnesium, mineral scale accumulates much faster inside the brass valve body, shortening the cartridge's functional lifespan. Fortunately, because Moen backs its products strongly and replacement parts are readily accessible, swapping an aging cartridge restores factory-new performance.
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