PROCEDURE 1
CHECK AND TEST 1
Check to see if drain channel is full of water.
Insert a stiff cord or belt
into pipe.
If the belt can pass through the pipe, it is blocked with soft food material.
PROCEDURE 2
Twist the belt to loosen food material stuck on pipe wall, then use water to flush food material out of pipe.
CHECK AND TEST 2
If belt could not pass through the drain pipe and water is still in channel, mark the belt at blockage point.
Measure the length.
DIAGNOSIS 1
DIAGNOSIS 1