Toilet issues like constant running, weak flushes

https://www.pitchero.com/clubs/eyelsh/news/common-plumbing-leaks-that-you-may-experience-2923600.html

Commode problems like consistent running, weak flushes, or tank leaks frequently come from used inlet valves or flappers; in older Geelong homes, out-of-date installations might likewise hide slow leakages that discolor floors and wall surfaces.