WATER CLOSET HINTS TO PREVENT THE TOILET FROM CONTINUALLY RUNNING OR REFILLING: 

DO NOT PUT CHLORINE TABLETS or any chlorine products in your toilet tank.  These products will destroy the rubber flapper in your tanks and cause water to leak and past the flapper then it will have to re-fill.

*NOTE*  If any chlorine products are used in then tank it will void the warranty on the tank flapper.