Having to hold the flush handle down for the entire flush cycle indicates that the flush chain connecting the trip lever arm to the rubber flapper is adjusted with too much slack. Because the chain is too loose, pressing the handle does not lift the flapper high or long enough to let all the water escape. Callout type="warning" title="Hygiene Warning": Wear rubber gloves when reaching into tank water. Verification: Open the tank lid, shorten the chain clip by one or two links to provide about 1/8 inch of slack, and test a normal handle press.
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