A toilet tank leaking from the bottom seal is usually caused by a deteriorated rubber tank-to-bowl gasket or degraded rubber washers on the mounting bolts. Over years of exposure to water and mineral treatment chemicals, these rubber seals lose their elasticity and flatten out, allowing water stored in the tank to seep through the bolt holes or the central flush opening onto the bathroom floor. Callout type="warning" title="Hygiene Warning": Shut off the water supply valve and drain the tank completely before replacing gaskets. Verification: Dry the underside of the tank and observe where droplets form during a refill cycle to confirm the gasket source.
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