concrete with 10 to 20 mm aggregate size decreased as
the P/G increased, while the porous concrete with 5 to 10
mm aggregate size showed no clear trend. However, like the
DO consumption rate, the removal rate of T-P may be
influenced primarily by the number of attached microbes.
It can be said about this that the porous concrete with 5 to 10
mm aggregate size had more microbes attached thereto, thus
having a higher T-P removal capacity.