An idea to make your own.
I made a homemade flow through bin. I did it differntly than the idea on the web site. It worked ok. I like a container or box style bin better. I know they are more work cleaning out the old stuff but they work better for me. I found at least with my homemade flow though bin it dried out faster than my container one's. But it does work and may people have them and love them. Good luck.