Leaking toilet flush: 3 ways to fix it yourself

Close the water supply tap;
Flush the toilet until there is no more water in the tank;
Unscrew the nuts that hold the retaining bolts in place with an adjustable wrench. To make it easier, hold the top of the bolt with a screwdriver;
Unscrew the locknut that connects the tank to the water supply line;
Detach the toilet tank;
Take a look at the condition of the rubber seal. If it is hard or cracked, it needs to be replaced. Remove it and place the new one in its place;
Replace the tank on the bowl and replace the retaining bolts;
Tighten the nuts gently;
Open the tap and fill your tank.
If the water supply line is the cause of the leak
Your water leak may also be coming from outside the tank. Check the supply line that connects your toilet to the plumbing network. Water may leak from fittings or a hole between them.

Avoid overtightening the nuts, as they can easily be damaged;
To avoid additional damage, first tighten them by hand, then use your wrench to make an additional quarter turn;
If the leak is coming from a hole between the water supply pipe fittings, there’s nothing you can do yourself! Contact a plumbing expert to make repairs.
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