Lani, We live in a very hard water area and don't have soft water. Our stool did the same thing and a friend who is a plumber recommended we use San-Teen. It is a de-limer and toilet bowl cleaner and can be found at most hardware stores. Seems there is a little hole straight above the flushing hole towards the front and it was almost sealed shut with lime deposits. This stuff is GREAT!!! Just follow the instructions on the bottle!