The heavy vitreous china ceramic bowl and tank of a TOTO toilet can easily last decades or even a lifetime (often fifty years or more) because high-fired porcelain does not degrade under normal household operating conditions. However, internal mechanical components housed inside the tank—such as plastic fill valves, flappers, canister seals, and trip levers—typically experience normal wear and require minor maintenance or component replacement every five to ten years to keep the fixture running smoothly.
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