This waste passes down drain pipes that lead to the grease trap. The grease trap's job is to slow the flow of water and allow it to cool inside the grease trap. As the water is slowed and cooled in the grease trap, greases and oils being lighter than water, float to the top of the grease trap. It is recommended that all grease traps be pumped 'cleaned' on a regular basis. If you do it in-house, you know that it is a dirty smelly job that no one likes doing.
Many establishments use outside services to perform regular scheduled pumping.
Pumping and servicing the grease trap on a regular basis, will keep it operating properly. No matter how often the grease trap is cleaned, some grease will escape from the grease trap, and become hard and cling to the interior of the drain and sewer pipes. Over time, this build up of oils and greases will cause clogs in the drain pipes and sewer lines. These clogs causes sewer backups, which obviously can be a serious health problem. The management will have to pay for the blockage to be removed.