Here's a picture of my newest
DIY project.
This is probably the easiest project I have done and was very cheap.
Total in parts is about $17.
Water comes in the bottom, goes through a mesh and through the media, through a mesh again and out the top.
It holds about 1 cup of media so it measures out very nicely.
the 1 1/2"
pvc is just there to hold the 2 meshes in place.
