The objective of the study is to find a way to utilize MSWI slag as filter material and to verify it. To
do so, stability as filter material was tested, and used Ju-Munjin filter sand as control group to run actual filtering
experiment to analyze filtering efficiency. According to result, MSWI slag is usable within designated waste
acceptable standards. Also, it showed similar level of filtering capability to filter sand. Thus, MSWI slag could help
to save and recycle resources if used as filtering material instead of filter sand As result of filtering test, SS and
COD showed about same level of filtering capability similar to standard filter sand. MSWI slag has shown 26.96%
higher with T-N, and 6.55% higher with T-P compared to standard filter sand. Also, remove efficiency comparison
result with No. 40#(0.43mm) and mixed diameter showed equal or greater filtering capability