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To fix the weak toilet flush issue, remove the toilet tank cover first. This cover is typically located on top of the tank and can be lifted or removed by carefully lifting it off.
After removing the toilet tank cover, the next step is to locate the flapper chain. Inside the tank, you will find the chain that is responsible for controlling the movement of the flapper.
If your toilet has a side handle, begin by disconnecting the chain from the arm it is attached to. This can typically be done by unhooking the chain from a small metal or plastic hook on the arm.