resulted that media used was contaminated with dirt
and grease, which might block the flow rate of
wastewater. Therefore, the maintenance and cleaning
of grease trap were required to extend a utility of
media. The research is consistent with Chu and Ng
(2000) [10] studied the performance improvement of
grease trap by using tube settler. It was found that the
treatment efficiencies of COD and FOG had increased.
The results also showed that the treatment efficiencies
of FOG were 79 - 87%. Wong et al. (2012) [11]
conducted the experimental study by installing the
filter in the 1,000 – 5,400 gallons of grease trap used in
the restaurants in Malaysia and the treatment efficiency
of SS was approximately 41 – 51% and the treatment
efficiency of FOG was approximately 43 – 52%