I have a semi-outdoor drain that looks like this (I have removed the grate):
The container of the drain is plastic, and there is a good 6 inches from the bottom of the drain to the pipe where the water leaves the drain.
This water never evaporates, and it has eventually turned into compost. This is bad right? I try to empty it every so often.
I would like to fill the bottom 6 inches of the drain with concrete so that the amount of standing water is minimized.
Is concrete the right material to use? It feels wrong filling a plastic container with concrete. Was there some good reason this drain was designed this way? If I don't use concrete, what material should I use?