The single most common toilet flush problem is a worn-out, warped, or degraded rubber flapper valve at the bottom of the tank that causes a constantly running toilet or a weak, sluggish flush because water leaks out before the tank can fill. Other extremely common issues include a tangled or snapped flush chain connecting the handle lever to the flapper, and misadjusted fill valve float heights resulting in low tank water levels. Verification: Inspect the tank interior to verify that the flapper seats flat and the water level reaches the fill line.
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