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.
Twist the belt to loosen food material stuck on pipe wall, then use water to flush food material out of pipe.
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 2