Adjust the water level so it is up to the mark, and see if it runs long enough during the refill process to return the water level in the bowl itself to a full capacity. If the bowl or the tank has less than a full level of water when it is flushed, the unit will not flush properly, but may flush properly every second time.: Toilet it does not completly flush. Until recently toilet completely flushed.I have used snake in main line and thru toilet trap. New tank year ago and fills to mark.
