There are a number of problems that can prevent grease traps from operating effectively.
Clog in Crossover
This occurs when FOGs and/or debris build up in the crossover line between the two compartments. If the crossover pipe is clogged, the liquid level in the first compartment will be too high while the level in the second compartment will be normal. The water may even be overflowing in the first compartment.
Clog in Incoming Line
A clog in the incoming line will quickly cause the lowest plumbing fixture in the restaurant to back up. Look for backed up floor drains. A backed up sink suggests that the branch line to that fixture is clogged as opposed to the grease trap incoming line.
Clog in Outgoing Line
If there is a clog in the outgoing line, the grease trap will overflow from both compartments. The clog may be in the line itself or in the city main. If you haven’t been pumping waste on cycle, the clog in the main may be your fault. Make sure to always dispose of waste water on cycle.
Full Grease Trap
A full grease trap results when grease has not been removed from the primary compartment in a timely fashion, causing it to spill over into the secondary compartment, and clogging crossover, incoming, and outgoing lines. To see if the trap is full, open the lid and use a pole to gauge the depth of the grease cap. If it reaches the bottom, then the trap is full. However, if you’re experiencing a grease trap problem, it’s usually not the case that the grease trap is full.
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