Project Source Drain Line / Trap Obstruction

Garbage disposal drains very slowly; water backs up into sink while disposal is off

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Clogged P-trap below disposal, Grease buildup in drain line, Food debris lodged in discharge elbow, Improperly sloped drain piping

How to Fix / Troubleshooting

Safety first: Turn off power to the disposal. Place a bucket under the trap before disassembly.

  • Check for standing water: If water stands in the sink, do not run the disposal until the blockage is cleared.
  • Clean P-trap: Loosen the slip nuts on the P-trap and remove it. Empty contents into the bucket and clean out any debris.
  • Inspect discharge elbow: Check the Project Source discharge elbow for obstructions and clean as needed.
  • Flush drain line: If the trap is clear, the clog may be further in the wall. Use a drain snake to clear the line or contact a plumber.
  • Reassemble and test: Reinstall the trap and fittings, run water, and test drainage with the disposal off and then on.
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Repair Difficulty

Medium 3/5

Required Part

Discharge Elbow & Sink Drain Trap
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