Fix leaking Caroma Stylus toilet for under $6. Stop that flushing sound!

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Our toilet's cistern was leaking water into the bowl and the inlet valve wouldn't stop filling up. We thought that the inlet valve was faulty but it could be something much simpler.
For us, we just needed to replace the washer and no more flushing sound! The washer is either worn or has bubbles in it, causing the water to drip down to the bowl. This causes the inlet valve to keep filling up (flushing sound) because it detects that the cistern is not up to its optimum level of water yet.
Hopefully, this will save you a bundle of money as the solution is only about $6 at your local hardware store.
Disclaimer: We are not trained or licensed plumbers.