A toilet that never stops running wastes gallons a day. This hands-on guide teaches you how to map the tank parts, run a dye test to locate the leak, replace a flapper the right way, adjust the float to one inch below the overflow, and swap a fill valve that will not shut off. You’ll confirm success with simple marks, timing, and an overnight check, then set a maintenance routine to keep the tank quiet all year. No brands, no hype, just field-tested steps in plain language. Perfect for first-time DIYers and property managers alike.