For my capstone, I think I want to try building a test of a biofilter. My design I want to try is a PVC pipe with a screw inside to create more surface area. Then fill the empty space with biomass, so that it can clean the water that passes from the top through the inside. I want to test and see the minimum length for the water to be noticeably cleaned, though frankly I could run the water back through multiple times if there is any cleaning at all.
Look and feel:
Furniture?
Cardboard
How to add water?
All implements are multi, focus on different ones
Just make the filter itself, not the inside?