The purpose of a grease trap/Interceptors is to separate grease, oil and waste from the drainage system to avoid reaching at the main sewer line. The principle of operation based on separation chambers with filters system with inlet and outlet in different levels. Grease entering the main sewer system will over time create blockages, foul odours and pest infestation. They are design only to have kitchen wastewater flowing through them and should never have wastewater from other drainage system sources such as toilets.