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Inside a greaseinterceptor.

See how it works
Preparing cutaway

  1. Dirty water from sinks and dishwashers enters here.

  2. This wall stops the dirty water from rushing straight through.

  3. The slowed water flow gives the solids, fats, oils, and grease in the dirty water time to separate.

  4. Fats, oils, and grease are lighter than water. They rise.

  5. Solids like food scraps sink to the bottom.

  6. Clean water stays in the middle.

  7. These traps must be emptied to keep F.O.G. from clogging city water lines!