The Root Cause

• Water goes down slowly and only flushes the bowl weakly.
  
  
• The water isn't swirling down with the usual force.
  
  
• The water bowl level does not drop down and then begins to rise past the normal full level of the bowl.
  
  
• The water rises so far past the full level of the bowl
  
  
• The water rises so far past the full level on the bowl, it actually overflows on to the bathroom floor.