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How to flush a toilet
Remove the tank cover and check for connection problems.
If you're having trouble flushing the toilet, start by checking the connections between the handle, flush chain, and flapper. Sometimes the chain can get disconnected from the handle or flapper, which prevents the toilet from flushing.
If the chain is disconnected, grab the loose end and slide a link onto the hook at the end of the handle arm. The tank water is fresh, not toilet water, so don't worry about reaching into it.