On the tiolets I know mine last fall overflowed from the tank and flooded my bathroom, bedroom and part of the living room. I usually turned the water off on it but was in a hurry and stressed out as this happened when Shimmer was really sick.
It turned out to need a new upright part of the kit. A friend changed it for me and of course he made it look easy but from watching him I don't think it was too hard and the kit even had directions right on the box.
Pam
"We must be willing to let go of the life we had planned so as to have the life that is waiting for us"