Here is an example of a single flush 12 litre water consumption per use, toilet suite.
Not that is it unrepairable, it is not water efficient for today's standards in toilet suites.
Our advice if your plumbing budget can afford a new toilet suite. We highly recommend installation of a new twin flush toilet suite 4.5/3 to reduce your maintenance cost's and water cost's on your bill.
So if your toilet is leaking, running or making that noise at night, call us, take a picture and we will see what we can do for you.
Your toilet suite could be replaced with one as shown below.